- Add WebSocket shutdown() with client notification and graceful close
- Enhance download service stop() with pending state persistence
- Expand FastAPI lifespan shutdown with proper cleanup sequence
- Add SQLite WAL checkpoint before database close
- Update stop_server.sh to use SIGTERM with timeout fallback
- Configure uvicorn timeout_graceful_shutdown=30s
- Update ARCHITECTURE.md with shutdown documentation
- Add total_items parameter to broadcast_scan_started and broadcast_scan_progress
- Pass total from SeriesApp to WebSocket broadcasts in AnimeService
- Update JS overlay to show progress bar and current/total count
- Add CSS for progress bar styling
- Add unit tests for new total_items parameter
- All 1024 tests passing
- Add broadcast_scan_started, broadcast_scan_progress, broadcast_scan_completed to WebSocketService
- Inject WebSocketService into AnimeService for real-time scan progress broadcasts
- Add CSS styles for scan progress overlay with spinner, stats, and completion state
- Update app.js to handle scan events and display progress overlay
- Add unit tests for new WebSocket broadcast methods
- All 1022 tests passing
- Updated src/server/api/websocket.py docstrings to document key as primary series identifier
- Updated src/server/models/websocket.py with detailed docstrings explaining key and folder fields in message payloads
- Updated src/server/services/websocket_service.py broadcast method docstrings to document key field usage
- Added WebSocket message example with key in infrastructure.md
- All 83 WebSocket tests pass
- Task 4.4 marked as complete in instructions.md
