fix(useVideoPlayer): 统一 buffered 状态与 refresh 逻辑

- 更新 CustomVideoPlayer 的 key 以包含 source
- 确保播放器组件在源切换时正确重新挂载

components/player/VideoPlayer.tsx

@@ -195,7 +195,7 @@ export function VideoPlayer({
         />
       ) : (
         <CustomVideoPlayer
-          key={`${useProxy ? 'proxy' : 'direct'}-${retryCount}`} // Only remount when switching modes or retrying, NOT when changing episodes
+          key={`${useProxy ? 'proxy' : 'direct'}-${retryCount}-${source}`} // Remount when switching sources, modes, or retrying
           src={finalPlayUrl}
           onError={handleVideoError}
           onTimeUpdate={handleTimeUpdate}