- 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
- New core/aria2_installer.py module downloads the latest aria2c release
from GitHub for Windows, macOS, and Linux with safe path extraction.
- New POST /model_resolver/aria2/install endpoint triggers installation
and saves the resolved aria2c_path plus download_backend=aria2.
- Options UI adds an Install aria2 button, hides aria2-specific fields
when another backend is selected, and updates status on completion.
- Includes .gitignore entry for tools/aria2/ so installed binaries are
not committed.
Dariusz L