feat: remove legacy device stat panels from dashboard

The total/online/offline/last-refresh mini panels are superseded by the
new module online-rate card.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

internal/modem/discovery.go

@@ -11,7 +11,11 @@ import (
 	"strings"
 )
 
-const quectelVendorID = "2c7c"
+const (
+	quectelVendorID = "2c7c"
+	djiVendorID     = "2ca3"
+	dji4GProductID  = "4006"
+)
 
 type SysFSDiscoverer struct {
 	SysRoot string
@@ -70,13 +74,13 @@ func (d *SysFSDiscoverer) Discover(ctx context.Context) ([]Candidate, error) {
 			resolvedDevice = devicePath
 		}
 		vendorID := strings.ToLower(readTrimmed(filepath.Join(resolvedDevice, "idVendor")))
-		if vendorID != quectelVendorID {
+		productID := strings.ToLower(readTrimmed(filepath.Join(resolvedDevice, "idProduct")))
+		if !isSupportedUSBModem(vendorID, productID) {
 			continue
 		}
 
 		state := devices[deviceName]
 		if state == nil {
-			productID := strings.ToLower(readTrimmed(filepath.Join(resolvedDevice, "idProduct")))
 			serialNumber := readTrimmed(filepath.Join(resolvedDevice, "serial"))
 			state = &discoveredUSBDevice{
 				candidate: Candidate{
@@ -141,6 +145,19 @@ func (d *SysFSDiscoverer) Discover(ctx context.Context) ([]Candidate, error) {
 	return result, nil
 }
 
+func isSupportedUSBModem(vendorID, productID string) bool {
+	return strings.EqualFold(strings.TrimSpace(vendorID), quectelVendorID) ||
+		IsDJI4GUSB(vendorID, productID)
+}
+
+// IsDJI4GUSB reports whether a USB identity belongs to the first-generation
+// DJI/Baiwang 4G module. It keeps the factory 2ca3:4006 identity usable without
+// requiring a persistent AT+QCFG USB identity rewrite to Quectel 2c7c:0125.
+func IsDJI4GUSB(vendorID, productID string) bool {
+	return strings.EqualFold(strings.TrimSpace(vendorID), djiVendorID) &&
+		strings.EqualFold(strings.TrimSpace(productID), dji4GProductID)
+}
+
 type discoveredWWANDevice struct {
 	index    string
 	ports    []Port

internal/modem/discovery_common_test.go

@@ -2,6 +2,29 @@ package modem
 
 import "testing"
 
+func TestSupportedUSBModemIdentity(t *testing.T) {
+	tests := []struct {
+		name      string
+		vendorID  string
+		productID string
+		want      bool
+	}{
+		{name: "Quectel", vendorID: "2c7c", productID: "0125", want: true},
+		{name: "DJI 4G module", vendorID: "2ca3", productID: "4006", want: true},
+		{name: "DJI 4G module uppercase", vendorID: "2CA3", productID: "4006", want: true},
+		{name: "unrelated DJI device", vendorID: "2ca3", productID: "001f", want: false},
+		{name: "unrelated USB device", vendorID: "0403", productID: "6001", want: false},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			if got := isSupportedUSBModem(test.vendorID, test.productID); got != test.want {
+				t.Fatalf("isSupportedUSBModem(%q, %q) = %v, want %v", test.vendorID, test.productID, got, test.want)
+			}
+		})
+	}
+}
+
 func TestSelectATPortPrefersTTYUSB2AcrossUSBCompositions(t *testing.T) {
 	ports := []Port{
 		{Name: "ttyUSB2", InterfaceNumber: 0x02, Role: PortRoleDiagnostic},

internal/modem/session.go

@@ -8,6 +8,7 @@ import (
 	"io"
 	"strings"
 	"sync"
+	"syscall"
 	"time"
 )
 
@@ -151,7 +152,7 @@ func (session *Session) executeLocked(ctx context.Context, command string) (Resp
 		session.poisonLocked()
 		return response, fmt.Errorf("write %s: %w", command, err)
 	}
-	if err := session.transport.Drain(); err != nil {
+	if err := drainTransport(ctx, session.transport); err != nil {
 		session.poisonLocked()
 		return response, fmt.Errorf("drain %s: %w", command, err)
 	}
@@ -178,7 +179,7 @@ func (session *Session) executePromptLocked(
 		session.poisonLocked()
 		return response, fmt.Errorf("write %s: %w", command, err)
 	}
-	if err := session.transport.Drain(); err != nil {
+	if err := drainTransport(ctx, session.transport); err != nil {
 		session.poisonLocked()
 		return response, fmt.Errorf("drain %s: %w", command, err)
 	}
@@ -203,7 +204,7 @@ func (session *Session) executePromptLocked(
 		response.Duration = time.Since(started)
 		return response, fmt.Errorf("terminate %s payload: %w", command, err)
 	}
-	if err := session.transport.Drain(); err != nil {
+	if err := drainTransport(ctx, session.transport); err != nil {
 		session.poisonLocked()
 		response.Duration = time.Since(started)
 		return response, fmt.Errorf("drain %s payload: %w", command, err)
@@ -211,6 +212,21 @@ func (session *Session) executePromptLocked(
 	return session.readFinalLocked(ctx, started, command, string(payload), response)
 }
 
+// drainTransport retries tcdrain/TCSBRK when the kernel interrupts it with a
+// signal. go.bug.st/serial already retries EINTR for Read, but its Linux
+// Drain implementation currently returns the transient error directly.
+func drainTransport(ctx context.Context, transport Transport) error {
+	for {
+		err := transport.Drain()
+		if !errors.Is(err, syscall.EINTR) {
+			return err
+		}
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+	}
+}
+
 func (session *Session) readFinalLocked(
 	ctx context.Context,
 	started time.Time,

internal/modem/session_test.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"sync"
+	"syscall"
 	"testing"
 	"time"
 )
@@ -27,6 +28,8 @@ type transcriptTransport struct {
 	unexpected    error
 	writePartial  bool
 	writeEvents   chan string
+	drainErrors   []error
+	drainCount    int
 }
 
 func (transport *transcriptTransport) Write(payload []byte) (int, error) {
@@ -114,7 +117,17 @@ func (transport *transcriptTransport) Read(buffer []byte) (int, error) {
 	return 0, nil
 }
 
-func (transport *transcriptTransport) Drain() error { return nil }
+func (transport *transcriptTransport) Drain() error {
+	transport.mu.Lock()
+	defer transport.mu.Unlock()
+	transport.drainCount++
+	if len(transport.drainErrors) == 0 {
+		return nil
+	}
+	err := transport.drainErrors[0]
+	transport.drainErrors = transport.drainErrors[1:]
+	return err
+}
 
 func (transport *transcriptTransport) ResetInputBuffer() error {
 	transport.mu.Lock()
@@ -138,6 +151,31 @@ func (transport *transcriptTransport) Close() error {
 	return nil
 }
 
+func TestSessionRetriesInterruptedDrain(t *testing.T) {
+	transport := &transcriptTransport{
+		steps: []transportStep{{
+			write:  "AT+CSQ\r",
+			chunks: []string{"\r\nAT+CSQ\r\n+CSQ: 24,99\r\nOK\r\n"},
+		}},
+		drainErrors: []error{syscall.EINTR},
+	}
+	session, err := NewSession(transport, SessionOptions{})
+	if err != nil {
+		t.Fatalf("NewSession() error = %v", err)
+	}
+
+	response, err := session.Execute(context.Background(), "AT+CSQ")
+	if err != nil {
+		t.Fatalf("Execute() error = %v", err)
+	}
+	if response.Final != "OK" {
+		t.Fatalf("response final = %q", response.Final)
+	}
+	if transport.drainCount != 2 {
+		t.Fatalf("Drain() calls = %d, want 2", transport.drainCount)
+	}
+}
+
 func TestSessionSeparatesInterleavedURCs(t *testing.T) {
 	transport := &transcriptTransport{steps: []transportStep{{
 		write: "AT+CSQ\r",

internal/server/device_api.go

@@ -142,6 +142,9 @@ func (s *Server) routeDeviceAPI(w http.ResponseWriter, r *http.Request) bool {
 		}
 		writeJSON(w, http.StatusOK, map[string]any{"data": s.dashboardDevices()})
 		return true
+	case "dashboard/host":
+		s.handleDashboardHost(w, r)
+		return true
 	case "devices":
 		return s.handleDevices(w, r)
 	case "devices/discovered":
@@ -387,6 +390,7 @@ func (s *Server) handleDiscoveredDevices(w http.ResponseWriter, r *http.Request)
 		result = append(result, map[string]any{
 			"hardware_kind":   candidate.HardwareKind,
 			"reader_name":     candidate.ReaderName,
+			"device_type":     discoveredDeviceType(candidate),
 			"discovery_key":   entry.ID,
 			"control_path":    controlPath,
 			"net_interface":   candidate.NetworkInterface,
@@ -1913,6 +1917,8 @@ func fillConfigFromPhysical(config *store.Device, entry device.Device) {
 		config.NetworkEnabled = false
 		config.SMSEnabled = true
 		config.VoWiFiEnabled = true
+	} else if modem.IsDJI4GUSB(candidate.VendorID, candidate.ProductID) {
+		config.DeviceType = store.DeviceTypeDJI4G
 	}
 	if config.Interface == "" {
 		config.Interface = candidate.NetworkInterface
@@ -1937,6 +1943,16 @@ func fillConfigFromPhysical(config *store.Device, entry device.Device) {
 	}
 }
 
+func discoveredDeviceType(candidate modem.Candidate) string {
+	if candidate.HardwareKind == "pcsc" {
+		return store.DeviceTypeUSBSIMReader
+	}
+	if modem.IsDJI4GUSB(candidate.VendorID, candidate.ProductID) {
+		return store.DeviceTypeDJI4G
+	}
+	return ""
+}
+
 func modemSummary(snapshot *device.Snapshot, phone string, phoneSource string) map[string]any {
 	if snapshot == nil {
 		return map[string]any{

internal/server/device_summary_test.go

@@ -6,10 +6,28 @@ import (
 	"time"
 
 	"vocat/internal/device"
+	"vocat/internal/modem"
 	"vocat/internal/store"
 	"vocat/internal/vowifi"
 )
 
+func TestFillConfigFromPhysicalClassifiesDJI4G(t *testing.T) {
+	config := store.Device{DeviceType: store.DeviceTypePCIeEC20EC25}
+	entry := device.Device{Candidate: modem.Candidate{
+		VendorID:  "2ca3",
+		ProductID: "4006",
+	}}
+
+	fillConfigFromPhysical(&config, entry)
+
+	if config.DeviceType != store.DeviceTypeDJI4G {
+		t.Fatalf("device type = %q, want %q", config.DeviceType, store.DeviceTypeDJI4G)
+	}
+	if got := discoveredDeviceType(entry.Candidate); got != store.DeviceTypeDJI4G {
+		t.Fatalf("discovered device type = %q, want %q", got, store.DeviceTypeDJI4G)
+	}
+}
+
 func TestConfiguredDeviceSummaryIgnoresVoWiFiRuntimeFromPreviousSIM(t *testing.T) {
 	database, err := store.Open(context.Background(), ":memory:")
 	if err != nil {

internal/server/host_stats.go

@@ -0,0 +1,468 @@
+package server
+
+import (
+	"net/http"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+)
+
+// hostStaticInfo describes hardware identities that do not change while the
+// process runs, so they are probed once and cached.
+type hostStaticInfo struct {
+	CPUModel    string `json:"cpu_model"`
+	BoardModel  string `json:"board_model"`
+	MemoryModel string `json:"memory_model"`
+	DiskModel   string `json:"disk_model"`
+}
+
+// hostPerfSnapshot is one rendered read of host utilization for the dashboard.
+type hostPerfSnapshot struct {
+	CPUPercent    float64 `json:"cpu_percent"`
+	MemoryPercent float64 `json:"memory_percent"`
+	MemoryUsed    uint64  `json:"memory_used_bytes"`
+	MemoryTotal   uint64  `json:"memory_total_bytes"`
+	DiskPercent   float64 `json:"disk_percent"`
+	DiskUsed      uint64  `json:"disk_used_bytes"`
+	DiskTotal     uint64  `json:"disk_total_bytes"`
+	NetRxBps      float64 `json:"net_rx_bps"`
+	NetTxBps      float64 `json:"net_tx_bps"`
+}
+
+// hostCPUTimes is one cumulative /proc/stat reading: idle already includes
+// iowait, total sums every other column (guest time is already folded into
+// user/nice and therefore excluded).
+type hostCPUTimes struct {
+	idle  uint64
+	total uint64
+}
+
+const (
+	// hostStatsMinGap keeps back-to-back polls from dividing a handful of
+	// jiffies by a few milliseconds; the previous rate is reused instead.
+	hostStatsMinGap = 300 * time.Millisecond
+	// hostStatsMaxGap mirrors liveNetMaxGap: a gap past this means the tab was
+	// closed or the browser was hidden; re-baseline instead of averaging a
+	// long dead interval.
+	hostStatsMaxGap = 15 * time.Second
+	// hostStatsFirstSample is how long the very first request blocks so CPU
+	// and network readings have a real interval to average over. It must
+	// exceed hostStatsMinGap so the re-read survives the min-gap guard below.
+	hostStatsFirstSample = 400 * time.Millisecond
+)
+
+// hostStatsSampler derives live host utilization from cumulative kernel
+// counters. Like liveNetTracker it is driven on demand by dashboard polling,
+// so no background goroutine is required.
+type hostStatsSampler struct {
+	mu        sync.Mutex
+	static    *hostStaticInfo
+	sampledAt time.Time
+	prevCPU   hostCPUTimes
+	prevNetRx uint64
+	prevNetTx uint64
+	lastCPU   float64
+	lastRxBps float64
+	lastTxBps float64
+}
+
+func newHostStatsSampler() *hostStatsSampler {
+	return &hostStatsSampler{}
+}
+
+// handleDashboardHost serves the dashboard host card: static hardware identity
+// plus live utilization. Both halves are cheap reads of /proc and /sys.
+func (s *Server) handleDashboardHost(w http.ResponseWriter, r *http.Request) {
+	if !requireMethod(w, r, http.MethodGet) {
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]any{"data": map[string]any{
+		"host": s.hostStats.info(),
+		"perf": s.hostStats.perf(),
+	}})
+}
+
+// info returns the cached static hardware description, probing it on first use.
+func (s *hostStatsSampler) info() hostStaticInfo {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.static == nil {
+		info := probeHostStatic()
+		s.static = &info
+	}
+	return *s.static
+}
+
+// perf renders one utilization snapshot. CPU and network rates need a baseline,
+// so the first-ever call takes a short inline second reading; later calls
+// average against the previous request.
+func (s *hostStatsSampler) perf() hostPerfSnapshot {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	now := time.Now()
+	cpu, cpuOK := readHostCPUTimes()
+	rx, tx, netOK := readHostNetTotals()
+
+	// No usable baseline yet (first request, or the tab was hidden past the
+	// max gap): establish one, then re-read after a short interval so the
+	// first dashboard paint already reports real numbers.
+	needBaseline := s.sampledAt.IsZero() || now.Sub(s.sampledAt) > hostStatsMaxGap
+	if needBaseline && (cpuOK || netOK) {
+		s.sampledAt = now
+		if cpuOK {
+			s.prevCPU = cpu
+		}
+		if netOK {
+			s.prevNetRx, s.prevNetTx = rx, tx
+		}
+		time.Sleep(hostStatsFirstSample)
+		now = time.Now()
+		if next, ok := readHostCPUTimes(); ok {
+			cpu, cpuOK = next, true
+		}
+		if nextRx, nextTx, ok := readHostNetTotals(); ok {
+			rx, tx, netOK = nextRx, nextTx, true
+		}
+	}
+
+	memPercent, memUsed, memTotal := readHostMemory()
+	diskPercent, diskUsed, diskTotal := readHostDisk()
+
+	gap := now.Sub(s.sampledAt)
+	if gap >= hostStatsMinGap && (cpuOK || netOK) {
+		if cpuOK {
+			if busyDelta, totalDelta := cpuDelta(s.prevCPU, cpu); totalDelta > 0 {
+				s.lastCPU = clampPercent(float64(busyDelta) * 100 / float64(totalDelta))
+			}
+			s.prevCPU = cpu
+		}
+		if netOK {
+			// Counter resets (interface flap) must not produce a giant spike.
+			if rx >= s.prevNetRx {
+				s.lastRxBps = float64(rx-s.prevNetRx) / gap.Seconds()
+			} else {
+				s.lastRxBps = 0
+			}
+			if tx >= s.prevNetTx {
+				s.lastTxBps = float64(tx-s.prevNetTx) / gap.Seconds()
+			} else {
+				s.lastTxBps = 0
+			}
+			s.prevNetRx, s.prevNetTx = rx, tx
+		}
+		s.sampledAt = now
+	}
+
+	return hostPerfSnapshot{
+		CPUPercent:    s.lastCPU,
+		MemoryPercent: memPercent,
+		MemoryUsed:    memUsed,
+		MemoryTotal:   memTotal,
+		DiskPercent:   diskPercent,
+		DiskUsed:      diskUsed,
+		DiskTotal:     diskTotal,
+		NetRxBps:      s.lastRxBps,
+		NetTxBps:      s.lastTxBps,
+	}
+}
+
+// cpuDelta returns the busy and total jiffies elapsed between two cumulative
+// readings. A backwards counter (theoretically impossible for /proc/stat)
+// reports zero rather than wrapping.
+func cpuDelta(prev, next hostCPUTimes) (busy, total uint64) {
+	if next.total <= prev.total || next.idle < prev.idle {
+		return 0, 0
+	}
+	totalDelta := next.total - prev.total
+	idleDelta := next.idle - prev.idle
+	if idleDelta >= totalDelta {
+		return 0, totalDelta
+	}
+	return totalDelta - idleDelta, totalDelta
+}
+
+func clampPercent(value float64) float64 {
+	switch {
+	case value < 0:
+		return 0
+	case value > 100:
+		return 100
+	default:
+		return value
+	}
+}
+
+// hostNetIgnoredPrefixes are virtual interface name prefixes whose counters
+// would double-count physical traffic (bridges, tunnels, vocat's own links) or
+// carry no real host traffic at all.
+var hostNetIgnoredPrefixes = []string{
+	"lo", "br-", "docker", "veth", "virbr", "vmnet", "vboxnet",
+	"ip6tnl", "ip6gre", "sit", "gre", "gretap", "erspan",
+	"tun", "tap", "utun", "vocat", "wg", "zt", "tailscale",
+	"ifb", "bond", "vlan", "macvlan", "dummy", "lxc", "cali", "flannel", "cni",
+}
+
+// hostNetInterfaceCounted reports whether an interface's byte counters feed the
+// host-level upload/download rates.
+func hostNetInterfaceCounted(name string) bool {
+	name = strings.TrimSpace(name)
+	if name == "" {
+		return false
+	}
+	for _, prefix := range hostNetIgnoredPrefixes {
+		if strings.HasPrefix(name, prefix) {
+			return false
+		}
+	}
+	return true
+}
+
+// parseNetDevCounters sums rx/tx bytes across counted interfaces in
+// /proc/net/dev content.
+func parseNetDevCounters(content string) (rx, tx uint64) {
+	for _, line := range strings.Split(content, "\n") {
+		name, rest, found := strings.Cut(line, ":")
+		if !found || !hostNetInterfaceCounted(name) {
+			continue
+		}
+		fields := strings.Fields(rest)
+		if len(fields) < 9 {
+			continue
+		}
+		rxBytes, okRx := parseUint(fields[0])
+		txBytes, okTx := parseUint(fields[8])
+		if !okRx || !okTx {
+			continue
+		}
+		rx += rxBytes
+		tx += txBytes
+	}
+	return rx, tx
+}
+
+func parseUint(text string) (uint64, bool) {
+	value, err := strconv.ParseUint(strings.TrimSpace(text), 10, 64)
+	return value, err == nil
+}
+
+// parseCPUTimes parses the aggregate "cpu" line of /proc/stat.
+func parseCPUTimes(line string) (hostCPUTimes, bool) {
+	fields := strings.Fields(line)
+	// cpu user nice system idle iowait irq softirq steal [guest guest_nice]
+	if len(fields) < 9 || fields[0] != "cpu" {
+		return hostCPUTimes{}, false
+	}
+	var times hostCPUTimes
+	for index, field := range fields[1:9] {
+		value, ok := parseUint(field)
+		if !ok {
+			return hostCPUTimes{}, false
+		}
+		times.total += value
+		if index == 3 || index == 4 { // idle + iowait
+			times.idle += value
+		}
+	}
+	return times, true
+}
+
+// parseMeminfo extracts MemTotal and MemAvailable (bytes) from /proc/meminfo.
+func parseMeminfo(content string) (total, available uint64, ok bool) {
+	for _, line := range strings.Split(content, "\n") {
+		key, rest, found := strings.Cut(line, ":")
+		if !found {
+			continue
+		}
+		var value uint64
+		switch strings.TrimSpace(key) {
+		case "MemTotal":
+			value, ok = parseUint(strings.TrimSpace(strings.TrimSuffix(strings.TrimSpace(rest), "kB")))
+			if ok {
+				total = value * 1024
+			}
+		case "MemAvailable":
+			if value, parsed := parseUint(strings.TrimSpace(strings.TrimSuffix(strings.TrimSpace(rest), "kB"))); parsed {
+				available = value * 1024
+			}
+		}
+	}
+	return total, available, total > 0
+}
+
+// parseCPUInfoModel returns the x86-style "model name" from /proc/cpuinfo, or
+// an empty string on ARM hosts that only carry CPU part numbers.
+func parseCPUInfoModel(content string) string {
+	for _, line := range strings.Split(content, "\n") {
+		key, value, found := strings.Cut(line, ":")
+		if !found {
+			continue
+		}
+		switch strings.TrimSpace(key) {
+		case "model name", "Model", "Hardware":
+			if model := strings.TrimSpace(value); model != "" {
+				return model
+			}
+		}
+	}
+	return ""
+}
+
+// parseCPUInfoPart returns the first ARM "CPU part" hex identifier (e.g.
+// 0xd03) and the number of processors listed.
+func parseCPUInfoPart(content string) (part string, processors int) {
+	for _, line := range strings.Split(content, "\n") {
+		key, value, found := strings.Cut(line, ":")
+		if !found {
+			continue
+		}
+		switch strings.TrimSpace(key) {
+		case "processor":
+			processors++
+		case "CPU part":
+			if part == "" {
+				part = strings.ToLower(strings.TrimSpace(value))
+			}
+		}
+	}
+	return part, processors
+}
+
+// armCPUPartNames maps ARM CPU part identifiers to marketing core names.
+var armCPUPartNames = map[string]string{
+	"0xd03": "Cortex-A53",
+	"0xd04": "Cortex-A35",
+	"0xd05": "Cortex-A55",
+	"0xd06": "Cortex-A65",
+	"0xd07": "Cortex-A57",
+	"0xd08": "Cortex-A72",
+	"0xd09": "Cortex-A73",
+	"0xd0a": "Cortex-A75",
+	"0xd0b": "Cortex-A76",
+	"0xd0c": "Neoverse-N1",
+	"0xd0d": "Cortex-A77",
+	"0xd0e": "Cortex-A76AE",
+	"0xd40": "Neoverse-V1",
+	"0xd41": "Cortex-A78",
+	"0xd42": "Cortex-A78AE",
+	"0xd44": "Cortex-X1",
+	"0xd46": "Cortex-A510",
+	"0xd47": "Cortex-A710",
+	"0xd48": "Cortex-X2",
+	"0xd4b": "Cortex-A715",
+	"0xd4d": "Cortex-A520",
+	"0xd4e": "Cortex-X3",
+}
+
+// socVendorNames prettifies the vendor half of a device-tree compatible entry.
+var socVendorNames = map[string]string{
+	"allwinner":   "Allwinner",
+	"amlogic":     "Amlogic",
+	"broadcom":    "Broadcom",
+	"mediatek":    "MediaTek",
+	"nvidia":      "NVIDIA",
+	"qualcomm":    "Qualcomm",
+	"raspberrypi": "Raspberry Pi",
+	"rockchip":    "Rockchip",
+	"samsung":     "Samsung",
+	"ti":          "TI",
+	"xunlong":     "Xunlong",
+}
+
+// parseCompatibleSoC extracts the SoC half of a device-tree compatible list
+// (NUL-separated, most specific first): "xunlong,orangepi-zero3\0allwinner,
+// sun50i-h618\0" yields "Allwinner sun50i-h618".
+func parseCompatibleSoC(raw string) string {
+	entries := strings.FieldsFunc(raw, func(r rune) bool { return r == 0 || r == '\n' })
+	// The last entry is the least specific compatible, which on ARM boards is
+	// the SoC rather than the board.
+	for index := len(entries) - 1; index >= 0; index-- {
+		entry := strings.TrimSpace(entries[index])
+		vendor, soc, found := strings.Cut(entry, ",")
+		if !found || soc == "" {
+			continue
+		}
+		if pretty, ok := socVendorNames[strings.ToLower(vendor)]; ok {
+			vendor = pretty
+		} else {
+			vendor = strings.ToUpper(vendor[:1]) + vendor[1:]
+		}
+		return vendor + " " + soc
+	}
+	return ""
+}
+
+// composeARMCPUModel renders e.g. "Allwinner sun50i-h618 · 4× Cortex-A53".
+func composeARMCPUModel(soc, part string, processors int) string {
+	core := armCPUPartNames[part]
+	var result string
+	switch {
+	case soc != "" && core != "" && processors > 0:
+		result = soc + " · " + strconv.Itoa(processors) + "× " + core
+	case soc != "" && processors > 0:
+		result = soc + " · " + strconv.Itoa(processors) + "× CPU"
+	case soc != "" && core != "":
+		result = soc + " · " + core
+	default:
+		result = soc
+	}
+	return result
+}
+
+// skipHostDisk reports whether a /sys/block entry is a virtual device whose
+// "model" would only clutter the host card.
+func skipHostDisk(name string) bool {
+	for _, prefix := range []string{"loop", "ram", "zram", "sr", "nbd", "dm-", "md", "mtdblock", "ubi", "ubiblock"} {
+		if strings.HasPrefix(name, prefix) {
+			return true
+		}
+	}
+	return false
+}
+
+// parseDmidecodeMemory extracts a compact "8 GB DDR4 M471A1K43CB1-CRC" style
+// description from `dmidecode -t 17` output, preferring the first populated
+// slot. Empty when no installed module can be described.
+func parseDmidecodeMemory(output string) string {
+	var size, memType, partNumber string
+	flush := func() string {
+		if size != "" && partNumber != "" {
+			return strings.TrimSpace(size + " " + memType + " " + partNumber)
+		}
+		if size != "" && memType != "" {
+			return strings.TrimSpace(size + " " + memType)
+		}
+		return ""
+	}
+	for _, line := range strings.Split(output, "\n") {
+		trimmed := strings.TrimSpace(line)
+		if strings.HasPrefix(line, "Memory Device") {
+			if composed := flush(); composed != "" {
+				return composed
+			}
+			size, memType, partNumber = "", "", ""
+			continue
+		}
+		key, value, found := strings.Cut(trimmed, ":")
+		if !found {
+			continue
+		}
+		value = strings.TrimSpace(value)
+		switch strings.TrimSpace(key) {
+		case "Size":
+			if !strings.Contains(value, "No Module") && value != "" && value != "Unknown" {
+				size = value
+			}
+		case "Type":
+			if value != "Unknown" && value != "Other" && !strings.HasPrefix(value, "<OUT OF SPEC") {
+				memType = value
+			}
+		case "Part Number":
+			if value != "Unknown" && value != "None" && value != "" {
+				partNumber = value
+			}
+		}
+	}
+	return flush()
+}

internal/server/host_stats_linux.go

@@ -0,0 +1,204 @@
+//go:build linux
+
+package server
+
+import (
+	"context"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+// probeHostStatic gathers the hardware identities shown on the dashboard host
+// card. Every probe is best-effort: empty fields render as "—" in the SPA.
+func probeHostStatic() hostStaticInfo {
+	return hostStaticInfo{
+		CPUModel:    readHostCPUModel(),
+		BoardModel:  readHostBoardModel(),
+		MemoryModel: readHostMemoryModel(),
+		DiskModel:   readHostDiskModel(),
+	}
+}
+
+// readHostCPUModel prefers the x86-style "model name"; on ARM hosts it composes
+// the device-tree SoC with the core count and Cortex part name.
+func readHostCPUModel() string {
+	cpuinfo, err := os.ReadFile("/proc/cpuinfo")
+	if err == nil {
+		if model := parseCPUInfoModel(string(cpuinfo)); model != "" {
+			return model
+		}
+		part, processors := parseCPUInfoPart(string(cpuinfo))
+		if processors == 0 {
+			processors = runtime.NumCPU()
+		}
+		soc := ""
+		if compatible, err := os.ReadFile("/proc/device-tree/compatible"); err == nil {
+			soc = parseCompatibleSoC(string(compatible))
+		}
+		if model := composeARMCPUModel(soc, part, processors); model != "" {
+			return model
+		}
+	}
+	return runtime.GOARCH
+}
+
+// readHostBoardModel reads the device-tree model on ARM boards and the DMI
+// board name on x86 machines.
+func readHostBoardModel() string {
+	if model, err := os.ReadFile("/proc/device-tree/model"); err == nil {
+		if text := strings.TrimSpace(strings.TrimRight(string(model), "\x00")); text != "" {
+			return text
+		}
+	}
+	dmiDir := "/sys/devices/virtual/dmi/id"
+	board := readSysfsTrimmed(filepath.Join(dmiDir, "board_name"))
+	vendor := readSysfsTrimmed(filepath.Join(dmiDir, "board_vendor"))
+	if board != "" && !isPlaceholderDMI(board) {
+		if vendor != "" && !isPlaceholderDMI(vendor) && !strings.Contains(strings.ToLower(board), strings.ToLower(vendor)) {
+			return vendor + " " + board
+		}
+		return board
+	}
+	if product := readSysfsTrimmed(filepath.Join(dmiDir, "product_name")); product != "" && !isPlaceholderDMI(product) {
+		return product
+	}
+	return ""
+}
+
+// isPlaceholderDMI filters the well-known "we never filled this in" DMI
+// strings so they do not surface as board models.
+func isPlaceholderDMI(value string) bool {
+	switch strings.ToLower(strings.TrimSpace(value)) {
+	case "", "default string", "to be filled by o.e.m.", "to be filled by o.e.m", "none", "unknown", "n/a", "not specified", "system manufacturer":
+		return true
+	}
+	return false
+}
+
+// readHostMemoryModel reports the installed DIMM description when dmidecode is
+// available (typical on x86 NAS/PC hosts) and falls back to total capacity,
+// which is all an ARM board exposes.
+func readHostMemoryModel() string {
+	if path, err := exec.LookPath("dmidecode"); err == nil {
+		ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+		defer cancel()
+		if output, err := exec.CommandContext(ctx, path, "-t", "17").Output(); err == nil {
+			if model := parseDmidecodeMemory(string(output)); model != "" {
+				return model
+			}
+		}
+	}
+	if total, _, ok := readHostMemoryBytes(); ok {
+		return formatLiveBytes(float64(total))
+	}
+	return ""
+}
+
+// readHostDiskModel describes physical block devices, skipping virtual ones
+// (loop, zram, device-mapper, mtd, optical). Multiple disks join with "; ".
+func readHostDiskModel() string {
+	entries, err := os.ReadDir("/sys/block")
+	if err != nil {
+		return ""
+	}
+	var disks []string
+	for _, entry := range entries {
+		name := entry.Name()
+		if skipHostDisk(name) {
+			continue
+		}
+		base := filepath.Join("/sys/block", name)
+		sizeText := readSysfsTrimmed(filepath.Join(base, "size"))
+		sectors, ok := parseUint(sizeText)
+		if !ok || sectors == 0 {
+			// An empty card reader reports size 0 and tells us nothing.
+			continue
+		}
+		model := readSysfsTrimmed(filepath.Join(base, "device", "model"))
+		if model == "" {
+			// MMC/SD cards carry the product name instead of a model string.
+			model = readSysfsTrimmed(filepath.Join(base, "device", "name"))
+		}
+		if model == "" {
+			model = name
+		}
+		capacity := formatLiveBytes(float64(sectors) * 512)
+		disks = append(disks, model+" · "+capacity)
+	}
+	return strings.Join(disks, "; ")
+}
+
+func readSysfsTrimmed(path string) string {
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		return ""
+	}
+	return strings.TrimSpace(strings.TrimRight(string(raw), "\x00"))
+}
+
+// readHostCPUTimes reads the aggregate counters from /proc/stat.
+func readHostCPUTimes() (hostCPUTimes, bool) {
+	raw, err := os.ReadFile("/proc/stat")
+	if err != nil {
+		return hostCPUTimes{}, false
+	}
+	for _, line := range strings.Split(string(raw), "\n") {
+		if strings.HasPrefix(line, "cpu ") {
+			return parseCPUTimes(line)
+		}
+	}
+	return hostCPUTimes{}, false
+}
+
+// readHostMemoryBytes returns MemTotal and MemAvailable in bytes.
+func readHostMemoryBytes() (total, available uint64, ok bool) {
+	raw, err := os.ReadFile("/proc/meminfo")
+	if err != nil {
+		return 0, 0, false
+	}
+	return parseMeminfo(string(raw))
+}
+
+// readHostMemory reports used/total bytes and the used percentage.
+func readHostMemory() (percent float64, used, total uint64) {
+	total, available, ok := readHostMemoryBytes()
+	if !ok || total == 0 {
+		return 0, 0, 0
+	}
+	used = total - available
+	return clampPercent(float64(used) * 100 / float64(total)), used, total
+}
+
+// readHostDisk reports root filesystem usage the way df does: usable space is
+// total minus reserved blocks, and the percentage is used/(used+available).
+func readHostDisk() (percent float64, used, total uint64) {
+	var stat unix.Statfs_t
+	if err := unix.Statfs("/", &stat); err != nil || stat.Blocks == 0 {
+		return 0, 0, 0
+	}
+	blockSize := uint64(stat.Bsize)
+	total = stat.Blocks * blockSize
+	free := stat.Bfree * blockSize
+	available := stat.Bavail * blockSize
+	used = total - free
+	if denominator := used + available; denominator > 0 {
+		percent = clampPercent(float64(used) * 100 / float64(denominator))
+	}
+	return percent, used, total
+}
+
+// readHostNetTotals sums rx/tx counters across physical host interfaces.
+func readHostNetTotals() (rx, tx uint64, ok bool) {
+	raw, err := os.ReadFile("/proc/net/dev")
+	if err != nil {
+		return 0, 0, false
+	}
+	rx, tx = parseNetDevCounters(string(raw))
+	return rx, tx, true
+}

internal/server/host_stats_other.go

@@ -0,0 +1,16 @@
+//go:build !linux
+
+package server
+
+// Host statistics are only meaningful on the Linux deployment target; on other
+// platforms every probe reports empty/zero and the dashboard renders "—".
+
+func probeHostStatic() hostStaticInfo { return hostStaticInfo{} }
+
+func readHostCPUTimes() (hostCPUTimes, bool) { return hostCPUTimes{}, false }
+
+func readHostNetTotals() (uint64, uint64, bool) { return 0, 0, false }
+
+func readHostMemory() (float64, uint64, uint64) { return 0, 0, 0 }
+
+func readHostDisk() (float64, uint64, uint64) { return 0, 0, 0 }

internal/server/host_stats_test.go

@@ -0,0 +1,184 @@
+package server
+
+import (
+	"testing"
+)
+
+func TestParseCPUTimes(t *testing.T) {
+	times, ok := parseCPUTimes("cpu  38073 0 24013 6762971 3121 0 3019 0 0 0")
+	if !ok {
+		t.Fatal("parseCPUTimes rejected a valid cpu line")
+	}
+	wantTotal := uint64(38073 + 0 + 24013 + 6762971 + 3121 + 0 + 3019 + 0)
+	if times.total != wantTotal {
+		t.Fatalf("total = %d, want %d", times.total, wantTotal)
+	}
+	if wantIdle := uint64(6762971 + 3121); times.idle != wantIdle {
+		t.Fatalf("idle = %d, want %d", times.idle, wantIdle)
+	}
+	if _, ok := parseCPUTimes("cpu0 1 2 3 4 5 6 7 8"); ok {
+		t.Fatal("per-core line must not parse as the aggregate line")
+	}
+	if _, ok := parseCPUTimes("cpu 1 2 3"); ok {
+		t.Fatal("truncated cpu line must not parse")
+	}
+}
+
+func TestCPUDelta(t *testing.T) {
+	prev := hostCPUTimes{idle: 100, total: 200}
+	next := hostCPUTimes{idle: 150, total: 300}
+	busy, total := cpuDelta(prev, next)
+	if busy != 50 || total != 100 {
+		t.Fatalf("cpuDelta = (%d, %d), want (50, 100)", busy, total)
+	}
+	if busy, total := cpuDelta(next, prev); busy != 0 || total != 0 {
+		t.Fatalf("backwards counters must report zero, got (%d, %d)", busy, total)
+	}
+}
+
+func TestParseMeminfo(t *testing.T) {
+	content := "MemTotal:        2040424 kB\nMemFree:          920864 kB\nMemAvailable:    1543480 kB\nBuffers:          315908 kB\n"
+	total, available, ok := parseMeminfo(content)
+	if !ok {
+		t.Fatal("parseMeminfo rejected valid content")
+	}
+	if total != 2040424*1024 {
+		t.Fatalf("total = %d, want %d", total, 2040424*1024)
+	}
+	if available != 1543480*1024 {
+		t.Fatalf("available = %d, want %d", available, 1543480*1024)
+	}
+}
+
+func TestParseNetDevCounters(t *testing.T) {
+	content := `Inter-|   Receive                                                |  Transmit
+ face |bytes    packets errs drop fifo frame compressed multicast|bytes    packets errs drop fifo colls carrier compressed
+    lo:      10       1    0    0    0     0          0         0       20       2    0    0    0     0       0          0
+  eth0:     100       1    0    0    0     0          0         0      200       2    0    0    0     0       0          0
+br-lan:    1000       1    0    0    0     0          0         0     2000       2    0    0    0     0       0          0
+  utun:     300       1    0    0    0     0          0         0      400       2    0    0    0     0       0          0
+vocat50a684ceb0: 500 1    0    0    0     0          0         0      600       2    0    0    0     0       0          0
+ wwan0:     700       1    0    0    0     0          0         0      800       2    0    0    0     0       0          0
+`
+	rx, tx := parseNetDevCounters(content)
+	// Only eth0 and wwan0 count; lo, br-lan, utun and vocat are virtual.
+	if rx != 800 || tx != 1000 {
+		t.Fatalf("rx,tx = %d,%d, want 800,1000", rx, tx)
+	}
+}
+
+func TestHostNetInterfaceCounted(t *testing.T) {
+	counted := []string{"eth0", "eth1", "wwan0", "usb0", "wlan0", "enp3s0", "pppoe-wan"}
+	for _, name := range counted {
+		if !hostNetInterfaceCounted(name) {
+			t.Fatalf("%s should be counted", name)
+		}
+	}
+	skipped := []string{"lo", "br-lan", "docker0", "veth123", "ip6tnl0", "sit0", "utun", "vocat50a684ceb0", "wg0", "tun0", "tailscale0", ""}
+	for _, name := range skipped {
+		if hostNetInterfaceCounted(name) {
+			t.Fatalf("%s should be skipped", name)
+		}
+	}
+}
+
+func TestParseCPUInfoModelX86(t *testing.T) {
+	content := "processor\t: 0\nvendor_id\t: GenuineIntel\nmodel name\t: Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz\n"
+	if model := parseCPUInfoModel(content); model != "Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz" {
+		t.Fatalf("model = %q", model)
+	}
+}
+
+func TestParseCPUInfoARM(t *testing.T) {
+	content := "processor\t: 0\nBogoMIPS\t: 48.00\nCPU implementer\t: 0x41\nCPU part\t: 0xd03\nprocessor\t: 1\nCPU part\t: 0xd03\n"
+	if model := parseCPUInfoModel(content); model != "" {
+		t.Fatalf("ARM cpuinfo must not report an x86 model name, got %q", model)
+	}
+	part, processors := parseCPUInfoPart(content)
+	if part != "0xd03" || processors != 2 {
+		t.Fatalf("part,processors = %q,%d, want 0xd03,2", part, processors)
+	}
+}
+
+func TestParseCompatibleSoC(t *testing.T) {
+	raw := "xunlong,orangepi-zero3\x00allwinner,sun50i-h618\x00"
+	if soc := parseCompatibleSoC(raw); soc != "Allwinner sun50i-h618" {
+		t.Fatalf("soc = %q", soc)
+	}
+	if soc := parseCompatibleSoC(""); soc != "" {
+		t.Fatalf("empty compatible must yield empty soc, got %q", soc)
+	}
+}
+
+func TestComposeARMCPUModel(t *testing.T) {
+	model := composeARMCPUModel("Allwinner sun50i-h618", "0xd03", 4)
+	if model != "Allwinner sun50i-h618 · 4× Cortex-A53" {
+		t.Fatalf("model = %q", model)
+	}
+	if model := composeARMCPUModel("", "", 0); model != "" {
+		t.Fatalf("empty inputs must yield empty model, got %q", model)
+	}
+}
+
+func TestParseDmidecodeMemory(t *testing.T) {
+	output := `# dmidecode 3.3
+Getting SMBIOS data from sysfs.
+SMBIOS 3.0 present.
+
+Handle 0x0010, DMI type 17, 40 bytes
+Memory Device
+	Array Handle: 0x000F
+	Error Information Handle: Not Provided
+	Total Width: 64 bits
+	Data Width: 64 bits
+	Size: 8 GB
+	Form Factor: SODIMM
+	Type: DDR4
+	Speed: 2400 MT/s
+	Manufacturer: Samsung
+	Serial Number: 12345678
+	Part Number: M471A1K43CB1-CRC
+	Rank: 1
+
+Handle 0x0011, DMI type 17, 40 bytes
+Memory Device
+	Size: No Module Installed
+	Type: Unknown
+`
+	if model := parseDmidecodeMemory(output); model != "8 GB DDR4 M471A1K43CB1-CRC" {
+		t.Fatalf("model = %q", model)
+	}
+	if model := parseDmidecodeMemory("Memory Device\n\tSize: No Module Installed\n"); model != "" {
+		t.Fatalf("unpopulated slots must yield empty model, got %q", model)
+	}
+}
+
+func TestClampPercent(t *testing.T) {
+	if clampPercent(-1) != 0 || clampPercent(101) != 100 || clampPercent(50) != 50 {
+		t.Fatal("clampPercent bounds violated")
+	}
+}
+
+func TestParseUintTrims(t *testing.T) {
+	if value, ok := parseUint(" 61440000 "); !ok || value != 61440000 {
+		t.Fatalf("parseUint = %d,%v", value, ok)
+	}
+	if _, ok := parseUint("not-a-number"); ok {
+		t.Fatal("parseUint accepted garbage")
+	}
+}
+
+func TestSkipHostDiskPrefixes(t *testing.T) {
+	skipped := []string{"loop0", "ram0", "zram0", "sr0", "nbd0", "dm-0", "md0", "mtdblock0", "ubiblock0_0"}
+	for _, name := range skipped {
+		if !skipHostDisk(name) {
+			t.Fatalf("%s should be skipped", name)
+		}
+	}
+	kept := []string{"sda", "nvme0n1", "mmcblk0", "vda", "sdb"}
+	for _, name := range kept {
+		if skipHostDisk(name) {
+			t.Fatalf("%s should be kept", name)
+		}
+	}
+}

internal/server/server.go

@@ -82,6 +82,7 @@ type Server struct {
 	updateApplying      bool
 	https               *httpsmode.Manager
 	netTraffic          *liveNetTracker
+	hostStats           *hostStatsSampler
 	publicIPMu          sync.RWMutex
 	publicIPs           map[string]cachedPublicIP
 	automaticTasks      *automaticTaskScheduler
@@ -133,6 +134,7 @@ func New(options Options) (*Server, error) {
 		updateToken:         strings.TrimSpace(options.UpdateToken),
 		https:               options.HTTPS,
 		netTraffic:          newLiveNetTracker(),
+		hostStats:           newHostStatsSampler(),
 		publicIPs:           make(map[string]cachedPublicIP),
 		updateCheck:         update.CheckLatest,
 		updateApply:         update.ApplyLatest,

internal/store/sms_reassembly.go

@@ -3,6 +3,7 @@ package store
 import (
 	"encoding/json"
 	"fmt"
+	"maps"
 	"sort"
 	"strconv"
 	"strings"
@@ -94,9 +95,15 @@ func mergeConcatSegment(
 			}
 		}
 	}
-	prior, alreadyHad := parts[sequence]
-	changed = !alreadyHad || prior != segmentBody
+	// Some IMS stacks hand us a cumulative segment: sequence 2 contains the
+	// already-decoded text of sequence 1 followed by its own payload. Keep a
+	// snapshot so normalizing that representation remains idempotent on a later
+	// redelivery of the same segment.
+	previousParts := maps.Clone(parts)
+	normalizeCumulativeConcatParts(previousParts)
 	parts[sequence] = segmentBody
+	normalizeCumulativeConcatParts(parts)
+	changed = !maps.Equal(previousParts, parts)
 
 	sequences := make([]int, 0, len(parts))
 	for n := range parts {
@@ -130,3 +137,24 @@ func mergeConcatSegment(
 	}
 	return joined.String(), json.RawMessage(encoded), changed, nil
 }
+
+// normalizeCumulativeConcatParts converts cumulative IMS segment bodies back
+// into ordinary per-segment bodies. It only removes an exact, non-empty prefix
+// assembled from every preceding sequence starting at 1, and only when the
+// current value also contains additional text. That deliberately leaves equal
+// repeated segments and incomplete/out-of-order prefixes untouched.
+func normalizeCumulativeConcatParts(parts map[int]string) {
+	var prefix strings.Builder
+	for sequence := 1; ; sequence++ {
+		text, ok := parts[sequence]
+		if !ok {
+			return
+		}
+		assembled := prefix.String()
+		if assembled != "" && len(text) > len(assembled) && strings.HasPrefix(text, assembled) {
+			text = strings.TrimPrefix(text, assembled)
+			parts[sequence] = text
+		}
+		prefix.WriteString(text)
+	}
+}

internal/store/sms_reassembly_test.go

@@ -101,6 +101,62 @@ func TestMergeConcatSegmentRedeliveryIsIdempotent(t *testing.T) {
 	}
 }
 
+func TestMergeConcatSegmentNormalizesCumulativeIMSPart(t *testing.T) {
+	first := strings.Repeat("安全提醒", 17)
+	want := first + "请通过官方渠道核实。"
+	_, extra, _, err := mergeConcatSegment(nil, first, concatExtra(t, 8, 2, 1))
+	if err != nil {
+		t.Fatal(err)
+	}
+	body, normalized, changed, err := mergeConcatSegment(extra, want, concatExtra(t, 8, 2, 2))
+	if err != nil || !changed {
+		t.Fatalf("cumulative segment: body=%q changed=%v err=%v", body, changed, err)
+	}
+	if body != want {
+		t.Fatalf("body = %q, want cumulative text once %q", body, want)
+	}
+
+	// Redelivering the cumulative wire representation must compare equal to the
+	// normalized stored representation and must not churn the durable row id.
+	body, _, changed, err = mergeConcatSegment(normalized, want, concatExtra(t, 8, 2, 2))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if changed || body != want {
+		t.Fatalf("redelivery: body=%q changed=%v, want %q/false", body, changed, want)
+	}
+}
+
+func TestMergeConcatSegmentNormalizesCumulativeIMSPartOutOfOrder(t *testing.T) {
+	first := strings.Repeat("甲", 67)
+	want := first + "尾段"
+	_, extra, _, err := mergeConcatSegment(nil, want, concatExtra(t, 12, 2, 2))
+	if err != nil {
+		t.Fatal(err)
+	}
+	body, _, changed, err := mergeConcatSegment(extra, first, concatExtra(t, 12, 2, 1))
+	if err != nil || !changed {
+		t.Fatalf("out-of-order segment: body=%q changed=%v err=%v", body, changed, err)
+	}
+	if body != want {
+		t.Fatalf("body = %q, want cumulative text once %q", body, want)
+	}
+}
+
+func TestMergeConcatSegmentKeepsEqualRepeatedPart(t *testing.T) {
+	_, extra, _, err := mergeConcatSegment(nil, "重复", concatExtra(t, 13, 2, 1))
+	if err != nil {
+		t.Fatal(err)
+	}
+	body, _, _, err := mergeConcatSegment(extra, "重复", concatExtra(t, 13, 2, 2))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if body != "重复重复" {
+		t.Fatalf("body = %q, want intentional equal segments preserved", body)
+	}
+}
+
 func TestMergeConcatSegmentWithoutHeaderPassesThrough(t *testing.T) {
 	extra, err := json.Marshal(map[string]any{"encoding": "gsm7"})
 	if err != nil {

web/src/components/dashboard/HostInfoCard.tsx

@@ -0,0 +1,40 @@
+import { ServerRegular } from "@fluentui/react-icons";
+import type { DashboardHostInfo } from "../../types";
+import { useI18n } from "../../lib/i18n";
+
+interface Row {
+  label: string;
+  value: string;
+}
+
+// 宿主机信息卡：CPU / 主板 / 内存 / 硬盘型号，后端一次性探测后缓存。
+export function HostInfoCard({ info }: { info?: DashboardHostInfo | null }) {
+  const { t } = useI18n();
+  const rows: Row[] = [
+    { label: t("CPU 型号"), value: info?.cpuModel || "" },
+    { label: t("主板型号"), value: info?.boardModel || "" },
+    { label: t("内存型号"), value: info?.memoryModel || "" },
+    { label: t("硬盘型号"), value: info?.diskModel || "" },
+  ];
+  return (
+    <div className="ui-panel p-4">
+      <div className="mb-3 flex items-center gap-2">
+        <ServerRegular className="h-4 w-4 text-sky-500" />
+        <h3 className="text-sm font-bold text-gray-800 dark:text-gray-100">{t("宿主机信息")}</h3>
+      </div>
+      <div className="space-y-2.5">
+        {rows.map((row) => (
+          <div key={row.label} className="flex items-baseline justify-between gap-3">
+            <span className="flex-shrink-0 text-xs text-gray-400">{row.label}</span>
+            <span
+              className="min-w-0 flex-1 truncate text-right text-xs font-medium text-gray-700 dark:text-gray-300"
+              title={row.value || undefined}
+            >
+              {row.value || "—"}
+            </span>
+          </div>
+        ))}
+      </div>
+    </div>
+  );
+}

web/src/components/dashboard/HostPerfCard.tsx

@@ -0,0 +1,81 @@
+import { ArrowDownRegular, ArrowUpRegular, GaugeRegular } from "@fluentui/react-icons";
+import type { DashboardHostPerf } from "../../types";
+import { useI18n } from "../../lib/i18n";
+import { cx, formatBytes } from "../../lib/utils";
+
+function percentText(value: number) {
+  return `${value.toFixed(1)}%`;
+}
+
+// 利用率越高颜色越危险：<70 绿，<90 黄，其余红。
+function barColor(percent: number) {
+  if (percent >= 90) return "bg-red-500";
+  if (percent >= 70) return "bg-amber-500";
+  return "bg-emerald-500";
+}
+
+function textColor(percent: number) {
+  if (percent >= 90) return "text-red-600 dark:text-red-400";
+  if (percent >= 70) return "text-amber-600 dark:text-amber-400";
+  return "text-emerald-600 dark:text-emerald-400";
+}
+
+function UsageBar({ label, percent, detail }: { label: string; percent: number; detail?: string }) {
+  const clamped = Math.min(100, Math.max(0, percent || 0));
+  return (
+    <div>
+      <div className="mb-1 flex items-baseline justify-between gap-2">
+        <span className="text-xs text-gray-400">{label}</span>
+        <span className="flex items-baseline gap-1.5">
+          {detail ? <span className="text-[10px] text-gray-400">{detail}</span> : null}
+          <span className={cx("text-xs font-bold tabular-nums", textColor(clamped))}>{percentText(clamped)}</span>
+        </span>
+      </div>
+      <div className="h-1.5 overflow-hidden rounded-full bg-gray-100 dark:bg-white/10">
+        <div
+          className={cx("h-full rounded-full transition-all duration-500", barColor(clamped))}
+          style={{ width: `${clamped}%` }}
+        />
+      </div>
+    </div>
+  );
+}
+
+// 性能信息卡：CPU / 内存 / 硬盘进度条 + 实时网络上下行速率。
+export function HostPerfCard({ perf }: { perf?: DashboardHostPerf | null }) {
+  const { t } = useI18n();
+  return (
+    <div className="ui-panel p-4">
+      <div className="mb-3 flex items-center gap-2">
+        <GaugeRegular className="h-4 w-4 text-sky-500" />
+        <h3 className="text-sm font-bold text-gray-800 dark:text-gray-100">{t("性能信息")}</h3>
+      </div>
+      <div className="space-y-2.5">
+        <UsageBar label={t("CPU 使用率")} percent={perf?.cpuPercent ?? 0} />
+        <UsageBar
+          label={t("内存使用率")}
+          percent={perf?.memoryPercent ?? 0}
+          detail={perf && perf.memoryTotalBytes > 0 ? `${formatBytes(perf.memoryUsedBytes)} / ${formatBytes(perf.memoryTotalBytes)}` : undefined}
+        />
+        <UsageBar
+          label={t("硬盘使用率")}
+          percent={perf?.diskPercent ?? 0}
+          detail={perf && perf.diskTotalBytes > 0 ? `${formatBytes(perf.diskUsedBytes)} / ${formatBytes(perf.diskTotalBytes)}` : undefined}
+        />
+        <div className="flex items-center justify-between gap-2 pt-0.5">
+          <span className="text-xs text-gray-400">{t("网络")}</span>
+          <span className="flex items-center gap-3 text-xs font-semibold tabular-nums">
+            <span className="flex items-center gap-1 text-sky-600 dark:text-sky-400" title={t("实时上传速率")}>
+              <ArrowUpRegular className="h-3.5 w-3.5" />
+              {formatBytes(perf?.netTxBps ?? 0)}/s
+            </span>
+            <span className="flex items-center gap-1 text-emerald-600 dark:text-emerald-400" title={t("实时下载速率")}>
+              <ArrowDownRegular className="h-3.5 w-3.5" />
+              {formatBytes(perf?.netRxBps ?? 0)}/s
+            </span>
+          </span>
+        </div>
+      </div>
+    </div>
+  );
+}

web/src/components/dashboard/OnlineRateCard.tsx

@@ -0,0 +1,56 @@
+import { PlugConnectedRegular } from "@fluentui/react-icons";
+import { useI18n, tf } from "../../lib/i18n";
+import { cx } from "../../lib/utils";
+
+// 模块在线率分四档：100% 绿，80-99% 黄，50-79% 橙，低于 50% 红。
+type RateLevel = "green" | "yellow" | "orange" | "red";
+
+function rateLevel(percent: number): RateLevel {
+  if (percent >= 100) return "green";
+  if (percent >= 80) return "yellow";
+  if (percent >= 50) return "orange";
+  return "red";
+}
+
+const LEVEL_STYLES: Record<RateLevel, { text: string; dot: string; labelKey: string }> = {
+  green: { text: "text-emerald-600 dark:text-emerald-400", dot: "bg-emerald-500", labelKey: "优秀" },
+  yellow: { text: "text-yellow-600 dark:text-yellow-400", dot: "bg-yellow-500", labelKey: "良好" },
+  orange: { text: "text-orange-600 dark:text-orange-400", dot: "bg-orange-500", labelKey: "一般" },
+  red: { text: "text-red-600 dark:text-red-400", dot: "bg-red-500", labelKey: "较差" },
+};
+
+// 模块在线率卡：汇总全部已添加且可识别的模块，大字号百分比按四档着色。
+export function OnlineRateCard({ online, total }: { online: number; total: number }) {
+  const { t } = useI18n();
+  const percent = total > 0 ? Math.round((online / total) * 100) : null;
+  const level = percent === null ? null : rateLevel(percent);
+  const styles = level ? LEVEL_STYLES[level] : null;
+
+  return (
+    <div className="ui-panel p-4">
+      <div className="mb-1 flex items-center gap-2">
+        <PlugConnectedRegular className="h-4 w-4 text-sky-500" />
+        <h3 className="text-sm font-bold text-gray-800 dark:text-gray-100">{t("模块在线率")}</h3>
+      </div>
+      <div className="flex items-center justify-center py-1">
+        {percent === null ? (
+          <div className="text-4xl font-extrabold text-gray-300 dark:text-gray-600">--%</div>
+        ) : (
+          <div className={cx("text-5xl font-extrabold tabular-nums leading-none", styles!.text)}>
+            {percent}
+            <span className="text-2xl">%</span>
+          </div>
+        )}
+      </div>
+      <div className="mt-2 flex items-center justify-center gap-2 text-xs text-gray-500 dark:text-gray-400">
+        {styles ? (
+          <span className="flex items-center gap-1">
+            <span className={cx("inline-block h-1.5 w-1.5 rounded-full", styles.dot)} />
+            {t(styles.labelKey)}
+          </span>
+        ) : null}
+        <span className="tabular-nums">{tf("{online}/{total} 台在线", { online, total })}</span>
+      </div>
+    </div>
+  );
+}

web/src/components/dashboard/UpcomingTasksCard.tsx

@@ -0,0 +1,58 @@
+import { CalendarClockRegular } from "@fluentui/react-icons";
+import { useNavigate } from "react-router-dom";
+import type { DashboardUpcomingTask } from "../../types";
+import { useI18n } from "../../lib/i18n";
+
+function formatRunAt(value: string): string {
+  if (!value || value.startsWith("0001-")) return "--";
+  const date = new Date(value);
+  if (Number.isNaN(date.getTime())) return "--";
+  return date.toLocaleString(undefined, {
+    month: "2-digit",
+    day: "2-digit",
+    hour: "2-digit",
+    minute: "2-digit",
+    hour12: false,
+  });
+}
+
+// 将要执行的定时任务卡：按 nextRunAt 升序取前 3 条已启用任务。
+export function UpcomingTasksCard({ tasks }: { tasks: DashboardUpcomingTask[] }) {
+  const { t } = useI18n();
+  const navigate = useNavigate();
+  return (
+    <div className="ui-panel p-4">
+      <div className="mb-3 flex items-center justify-between">
+        <div className="flex items-center gap-2">
+          <CalendarClockRegular className="h-4 w-4 text-sky-500" />
+          <h3 className="text-sm font-bold text-gray-800 dark:text-gray-100">{t("将要执行的定时任务")}</h3>
+        </div>
+        <button
+          type="button"
+          onClick={() => navigate("/automatic-tasks")}
+          className="text-xs font-medium text-sky-600 transition-colors hover:text-sky-700 dark:text-sky-400 dark:hover:text-sky-300"
+        >
+          {t("查看全部")}
+        </button>
+      </div>
+      {tasks.length === 0 ? (
+        <div className="flex h-[4.5rem] items-center justify-center text-xs text-gray-400">
+          {t("暂无定时任务")}
+        </div>
+      ) : (
+        <div className="divide-y divide-gray-100 dark:divide-white/5">
+          {tasks.map((task) => (
+            <div key={task.id} className="flex items-center justify-between gap-3 py-2 first:pt-0 last:pb-0">
+              <span className="min-w-0 flex-1 truncate text-xs font-medium text-gray-700 dark:text-gray-300" title={task.name}>
+                {task.name}
+              </span>
+              <span className="flex-shrink-0 font-mono text-xs tabular-nums text-gray-500 dark:text-gray-400">
+                {formatRunAt(task.nextRunAt)}
+              </span>
+            </div>
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}

web/src/lib/i18n-en.ts

@@ -291,6 +291,24 @@ export const EN_DICT: Record<string, string> = {
   重试: "Retry",
   暂无设备接入: "No devices connected",
   请先在设备管理中添加或接管设备: "Add or adopt a device on the Devices page first",
+  宿主机信息: "Host Hardware",
+  "CPU 型号": "CPU Model",
+  主板型号: "Motherboard",
+  内存型号: "Memory",
+  硬盘型号: "Disk",
+  性能信息: "Performance",
+  "CPU 使用率": "CPU Usage",
+  内存使用率: "Memory Usage",
+  硬盘使用率: "Disk Usage",
+  将要执行的定时任务: "Upcoming Scheduled Tasks",
+  查看全部: "View All",
+  暂无定时任务: "No scheduled tasks",
+  模块在线率: "Module Online Rate",
+  优秀: "Excellent",
+  良好: "Good",
+  一般: "Fair",
+  较差: "Poor",
+  "{online}/{total} 台在线": "{online}/{total} online",
 
   // ---- 设置页：通用 ----
   管理网关参数与运行信息: "Manage gateway parameters and runtime info",

web/src/pages/DashboardPage.tsx

@@ -1,7 +1,7 @@
 import { useCallback, useState } from "react";
 import { useNavigate } from "react-router-dom";
 import { api } from "../api";
-import type { DashboardDevice } from "../types";
+import type { DashboardDevice, DashboardHost, DashboardUpcomingTask } from "../types";
 import { usePolling } from "../lib/usePolling";
 import { useI18n } from "../lib/i18n";
 import { PageHeader } from "../components/ui/PageHeader";
@@ -10,9 +10,17 @@ import { ErrorState } from "../components/ui/ErrorState";
 import { ListSkeleton } from "../components/ui/ListSkeleton";
 import { EmptyState } from "../components/ui/EmptyState";
 import { DeviceCard } from "../components/DeviceCard";
+import { HostInfoCard } from "../components/dashboard/HostInfoCard";
+import { HostPerfCard } from "../components/dashboard/HostPerfCard";
+import { UpcomingTasksCard } from "../components/dashboard/UpcomingTasksCard";
+import { OnlineRateCard } from "../components/dashboard/OnlineRateCard";
 
 interface LoadError { message: string; status?: number; method?: string; url?: string }
 
+// 任务卡只展示最近的三条；定时任务变化慢，轮询间隔比设备/性能数据更宽。
+const UPCOMING_TASK_COUNT = 3;
+const TASKS_POLL_INTERVAL = 15000;
+
 export default function DashboardPage() {
   const { t } = useI18n();
   const navigate = useNavigate();
@@ -20,7 +28,8 @@ export default function DashboardPage() {
   const [devicesLoading, setDevicesLoading] = useState(false);
   const [devicesError, setDevicesError] = useState<LoadError | null>(null);
   const [devicesOkAt, setDevicesOkAt] = useState<number | null>(null);
-  const [lastRefresh, setLastRefresh] = useState<number | null>(null);
+  const [host, setHost] = useState<DashboardHost | null>(null);
+  const [upcomingTasks, setUpcomingTasks] = useState<DashboardUpcomingTask[]>([]);
 
   const fetchDevices = useCallback(async () => {
     setDevicesLoading(true);
@@ -28,9 +37,7 @@ export default function DashboardPage() {
       const list = await api<DashboardDevice[]>("/dashboard/devices");
       setDevices(list || []);
       setDevicesError(null);
-      const now = Date.now();
-      setDevicesOkAt(now);
-      setLastRefresh(now);
+      setDevicesOkAt(Date.now());
     } catch (e: any) {
       setDevicesError({ message: e?.message || t("加载失败"), status: e?.status });
     } finally {
@@ -38,11 +45,34 @@ export default function DashboardPage() {
     }
   }, []);
 
+  // 宿主机信息 + 性能数据：2s 轮询让网络速率足够"实时"。
+  const fetchHost = useCallback(async () => {
+    try {
+      setHost(await api<DashboardHost>("/dashboard/host"));
+    } catch {
+      /* 宿主机数据失败不打断设备监控；保留上一次成功值。 */
+    }
+  }, []);
+
+  const fetchUpcomingTasks = useCallback(async () => {
+    try {
+      const data = await api<{ tasks?: DashboardUpcomingTask[] }>("/automatic-tasks");
+      const upcoming = (data.tasks || [])
+        .filter((task) => task.enabled && task.nextRunAt && !task.nextRunAt.startsWith("0001-"))
+        .sort((a, b) => new Date(a.nextRunAt).getTime() - new Date(b.nextRunAt).getTime())
+        .slice(0, UPCOMING_TASK_COUNT);
+      setUpcomingTasks(upcoming);
+    } catch {
+      /* 任务列表加载失败时保留旧数据。 */
+    }
+  }, []);
+
   usePolling(fetchDevices, 5000);
+  usePolling(fetchHost, 2000);
+  usePolling(fetchUpcomingTasks, TASKS_POLL_INTERVAL);
 
   const total = devices.length;
   const online = devices.filter((d) => d?.healthy).length;
-  const offline = Math.max(0, total - online);
   const openDevice = (id: string) => navigate(`/devices?device=${encodeURIComponent(id)}&tab=overview`);
 
   return (
@@ -52,11 +82,11 @@ export default function DashboardPage() {
         subtitle={t("实时监测模组检测状态与出口连通性")}
         actions={<RefreshButton loading={devicesLoading} onClick={fetchDevices} />}
       />
-      <div className="mb-6 grid grid-cols-1 gap-4 sm:grid-cols-2 lg:grid-cols-4">
-        <div className="ui-panel p-4"><div className="text-xs text-gray-400">{t("设备总数")}</div><div className="mt-1 text-2xl font-extrabold">{total}</div></div>
-        <div className="ui-panel p-4"><div className="text-xs text-gray-400">{t("在线")}</div><div className="mt-1 text-2xl font-extrabold text-green-600 dark:text-green-400">{online}</div></div>
-        <div className="ui-panel p-4"><div className="text-xs text-gray-400">{t("离线")}</div><div className="mt-1 text-2xl font-extrabold text-red-600 dark:text-red-400">{offline}</div></div>
-        <div className="ui-panel p-4"><div className="text-xs text-gray-400">{t("最近刷新")}</div><div className="mt-2 font-mono text-sm text-gray-600 dark:text-gray-300">{lastRefresh ? new Date(lastRefresh).toLocaleTimeString() : "--:--:--"}</div></div>
+      <div className="mb-6 grid grid-cols-1 gap-4 md:grid-cols-2 xl:grid-cols-4">
+        <HostInfoCard info={host?.host} />
+        <HostPerfCard perf={host?.perf} />
+        <UpcomingTasksCard tasks={upcomingTasks} />
+        <OnlineRateCard online={online} total={total} />
       </div>
       {devicesError ? (
         <ErrorState className="mb-6" title={t("设备列表加载失败")} message={devicesError.message} statusCode={devicesError.status} requestMethod={devicesError.method} requestUrl={devicesError.url} lastSuccessAt={devicesOkAt} retryText={t("重试")} onRetry={fetchDevices} />

web/src/pages/DevicesPage.tsx

@@ -398,7 +398,7 @@ export default function DevicesPage() {
         modemImei: d.imei || "",
         usbPath: d.usbPath || "",
         deviceBackend: backend,
-		deviceType: isReader ? "usb_sim_reader" : prev.deviceType,
+		deviceType: d.deviceType || (isReader ? "usb_sim_reader" : prev.deviceType),
 		esimTransport: isReader ? "pcsc" : backend,
       };
     });

web/src/types.ts

@@ -144,6 +144,38 @@ export interface DashboardDevice {
   model?: string;
 }
 
+export interface DashboardHostInfo {
+  cpuModel: string;
+  boardModel: string;
+  memoryModel: string;
+  diskModel: string;
+}
+
+export interface DashboardHostPerf {
+  cpuPercent: number;
+  memoryPercent: number;
+  memoryUsedBytes: number;
+  memoryTotalBytes: number;
+  diskPercent: number;
+  diskUsedBytes: number;
+  diskTotalBytes: number;
+  netRxBps: number;
+  netTxBps: number;
+}
+
+export interface DashboardHost {
+  host: DashboardHostInfo;
+  perf: DashboardHostPerf;
+}
+
+// 仪表盘定时任务卡只关心名字与下次执行时间。
+export interface DashboardUpcomingTask {
+  id: number;
+  name: string;
+  enabled: boolean;
+  nextRunAt: string;
+}
+
 export interface DeviceOverview extends DeviceListItem {
   atPort?: string;
   audioDevice?: string;
@@ -174,6 +206,7 @@ export interface DeviceStatus {
 export interface DiscoveredDevice {
 	 hardwareKind?: string;
 	 readerName?: string;
+  deviceType?: DeviceType;
   discoveryKey: string;
   controlPath: string;
   netInterface: string;