feat(db/m7-cover-sources): SQL queries for provider settings + recheck

- Extends GetAlbumCoverageRollup's with_art FILTER to include
  'theaudiodb' so F's coverage gauge surfaces TheAudioDB-found rows
  as with_art rather than silently undercounting.
- Modifies ListAlbumsMissingCover to take the current sources_version
  as a parameter; eligibility now includes stale-'none' rows.
- Adds SetAlbumCoverWithVersion (atomic write of path + source +
  version stamp) and the parallel SetArtistArtWithVersion +
  ClearArtistArtNone + ListArtistsMissingArt for the artist-art
  enricher.
- New coverart_settings.sql with ListProviderSettings,
  UpsertProviderSettings (boot reconciliation, preserves operator
  values on conflict), UpdateProviderSettings (admin PATCH; tri-
  state api_key handling), GetCurrentSourcesVersion,
  BumpSourcesVersion (RETURNING the new value).

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 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 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
@@ -153,6 +153,7 @@ func (q *Queries) ListLikedAlbumRows(ctx context.Context, arg ListLikedAlbumRows
 			&i.CreatedAt,
 			&i.UpdatedAt,
 			&i.CoverArtSource,
+			&i.CoverArtSourcesVersion,
 		); err != nil {
 			return nil, err
 		}
@@ -189,7 +190,7 @@ func (q *Queries) ListLikedArtistIDs(ctx context.Context, userID pgtype.UUID) ([
 }
 
 const listLikedArtistRows = `-- name: ListLikedArtistRows :many
-SELECT a.id, a.name, a.sort_name, a.mbid, a.created_at, a.updated_at FROM artists a
+SELECT a.id, a.name, a.sort_name, a.mbid, a.created_at, a.updated_at, a.artist_thumb_path, a.artist_fanart_path, a.artist_art_source, a.artist_art_sources_version FROM artists a
 JOIN general_likes_artists l ON l.artist_id = a.id
 WHERE l.user_id = $1
 ORDER BY l.liked_at DESC
@@ -218,6 +219,10 @@ func (q *Queries) ListLikedArtistRows(ctx context.Context, arg ListLikedArtistRo
 			&i.Mbid,
 			&i.CreatedAt,
 			&i.UpdatedAt,
+			&i.ArtistThumbPath,
+			&i.ArtistFanartPath,
+			&i.ArtistArtSource,
+			&i.ArtistArtSourcesVersion,
 		); err != nil {
 			return nil, err
 		}