- Use correct server request types: 'tracks', 'albums', 'artists',
'artist.albums', 'album.tracks' (were singular, caused timeouts)
- Normalize artists to strings (server may send dicts)
- Use native plugin IDs (iTunes/Spotify) instead of soul_id for
album/artist/track IDs so downstream endpoints can resolve them
- Carry soul_id and plugin_id in external_urls for routing
- Pass plugin param from frontend to server for correct client routing
(iTunes vs Deezer vs Spotify) with isdigit() fallback
- Route source=hydrabase to iTunes client for artist images
- Include external_urls in enhanced search API response
- Reduce WebSocket timeout from 15s to 8s