- New core/discogs_worker.py — background worker enriching artists and
albums with Discogs metadata following AudioDBWorker pattern exactly
- Artist enrichment: discogs_id, bio, members, URLs, image backfill,
genre backfill, summary backfill from bio
- Album enrichment: discogs_id, genres, styles (400+ taxonomy), label,
catalog number, country, community rating, image backfill
- DB migration: discogs columns on artists (id, match_status, bio,
members, urls) and albums (id, match_status, genres, styles, label,
catno, country, rating, rating_count)
- Worker initialization with pause/resume persistence
- Status/pause/resume API endpoints
- Integrated into enrichment status system, rate monitor, auto-pause
during downloads/scans, WebSocket status emission
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