- SeriesApp now passes skip_load=True to SerieList
- Prevents redundant data file loading on every startup
- Series loaded once during setup via sync_series_from_data_files()
- Removed obsolete _init_list_sync() and _init_list() methods
- Updated documentation in ARCHITECTURE.md and README.md
- 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