admin 2074d4fb78 Add background upload management feature ...

- Add BackgroundUploadManager class for managing uploads in background
- Create background upload button and panel UI
- Implement upload state transfer when modal closes
- Add real-time progress tracking for background uploads
- Support up to 5 concurrent uploads
- Display upload progress with percentage and chunk info
- Auto-hide background UI when all uploads complete
- Add responsive design for background panel

2026-01-23 15:46:51 +08:00

18 KiB

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