a37e381c4e
- Audio devices endpoint now includes Bluetooth Audio (bluealsa) and other software PCM devices from aplay -L - Added GET/POST /api/backing-source endpoints with JACK port routing - Backing Track Source dropdown in Audio section (None, Bluetooth Audio, or any JACK capture port found) - Selecting a source routes it into fx_in:input_2 via jack_connect - Also supports bt_audio:capture_1/2 from existing JACK bridge