feat(library): store each album's MusicBrainz release-group id (M483 #5242)

albums.mbid is the release id (Picard's musicbrainz_albumid, one edition).
Lidarr names albums by release group, so re-acquisition and request
completion need that id too (#5241).

Migration 0070 adds albums.release_group_mbid (nullable, non-unique index:
several releases share a group). The scanner reads musicbrainz_releasegroupid
through extractReleaseGroupMBID, writes it on insert and heals it onto
existing rows when NULL. tagReadVersion goes to 3 so the next scan fills
it for the library already indexed, bound by tag reads (no ffprobe, no
decode).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/db/dbq/likes.sql.go

@@ -120,7 +120,7 @@ func (q *Queries) ListLikedAlbumIDs(ctx context.Context, userID pgtype.UUID) ([]
 }
 
 const listLikedAlbumRows = `-- name: ListLikedAlbumRows :many
-SELECT a.id, a.title, a.sort_title, a.artist_id, a.release_date, a.mbid, a.cover_art_path, a.created_at, a.updated_at, a.cover_art_source, a.cover_art_sources_version FROM albums a
+SELECT a.id, a.title, a.sort_title, a.artist_id, a.release_date, a.mbid, a.cover_art_path, a.created_at, a.updated_at, a.cover_art_source, a.cover_art_sources_version, a.release_group_mbid FROM albums a
 JOIN general_likes_albums l ON l.album_id = a.id
 WHERE l.user_id = $1
 ORDER BY l.liked_at DESC
@@ -154,6 +154,7 @@ func (q *Queries) ListLikedAlbumRows(ctx context.Context, arg ListLikedAlbumRows
 			&i.UpdatedAt,
 			&i.CoverArtSource,
 			&i.CoverArtSourcesVersion,
+			&i.ReleaseGroupMbid,
 		); err != nil {
 			return nil, err
 		}