- Add /aria2/start and /aria2/stop API endpoints for explicit daemon lifecycle control
- Track aria2 daemon state (managed/running/version/active_transfers) in get_aria2_status
- Implement idle auto-stop timer (5 minutes) with aria2_auto_stop_daemon setting
- Add start_aria2_daemon() and stop_aria2_daemon() helpers in core/downloader.py
- Migrate legacy release-* install directories to normalized versioned paths
- Normalize aria2 version strings (strip release-/v prefixes) in installer metadata
- Update aria2 archive extraction to extract-to-temp then copy into canonical dir
- Add frontend daemon controls: status display, stop button, auto-stop toggle
Dariusz L
54f861a02e