Add a third playback source: a ListenBrainz recommendations Atom feed. Each
suggestion already carries a MusicBrainz recording MBID, title and artist, so
it is keyed directly by MBID (source-agnostic identity, no extra lookup) and
resolved to a concrete file — Navidrome search3 first, then a yt-dlp
ytsearch1: fallback.
- providers/listenbrainz.py: parse the Atom/HTML feed, anti-repeat on the MBID
key, resolve Navidrome-then-yt-dlp. Feed may be an http(s) URL or a local
path (for testing).
- subsonic.py: add search_songs (search3) for resolution.
- canonicalizer.py: short-circuit when a Track already has an MBID, so
feed-provided MBIDs are trusted and MusicBrainz is not hit.
- __main__.py: wire the provider in; register the yt-dlp fetcher as a
resolution backend even when the yt-dlp source is off; close providers on
shutdown.
- config/compose/.env.example: RADIEO_LISTENBRAINZ_URL + weight.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>