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/models.go

@@ -188,25 +188,30 @@ func (ns NullLidarrRequestStatus) Value() (driver.Value, error) {
 }
 
 type Album struct {
-	ID             pgtype.UUID
-	Title          string
-	SortTitle      string
-	ArtistID       pgtype.UUID
-	ReleaseDate    pgtype.Date
-	Mbid           *string
-	CoverArtPath   *string
-	CreatedAt      pgtype.Timestamptz
-	UpdatedAt      pgtype.Timestamptz
-	CoverArtSource *string
+	ID                     pgtype.UUID
+	Title                  string
+	SortTitle              string
+	ArtistID               pgtype.UUID
+	ReleaseDate            pgtype.Date
+	Mbid                   *string
+	CoverArtPath           *string
+	CreatedAt              pgtype.Timestamptz
+	UpdatedAt              pgtype.Timestamptz
+	CoverArtSource         *string
+	CoverArtSourcesVersion int32
 }
 
 type Artist struct {
-	ID        pgtype.UUID
-	Name      string
-	SortName  string
-	Mbid      *string
-	CreatedAt pgtype.Timestamptz
-	UpdatedAt pgtype.Timestamptz
+	ID                      pgtype.UUID
+	Name                    string
+	SortName                string
+	Mbid                    *string
+	CreatedAt               pgtype.Timestamptz
+	UpdatedAt               pgtype.Timestamptz
+	ArtistThumbPath         *string
+	ArtistFanartPath        *string
+	ArtistArtSource         *string
+	ArtistArtSourcesVersion int32
 }
 
 type ArtistSimilarity struct {
@@ -236,6 +241,20 @@ type ContextualLike struct {
 	SessionID     pgtype.UUID
 }
 
+type CoverArtProviderSetting struct {
+	ProviderID   string
+	Enabled      bool
+	ApiKey       *string
+	DisplayOrder int32
+	CreatedAt    pgtype.Timestamptz
+	UpdatedAt    pgtype.Timestamptz
+}
+
+type CoverArtSourcesMetum struct {
+	ID             bool
+	CurrentVersion int32
+}
+
 type GeneralLike struct {
 	UserID  pgtype.UUID
 	TrackID pgtype.UUID
@@ -364,13 +383,14 @@ type PlaylistTrack struct {
 }
 
 type ScanRun struct {
-	ID           pgtype.UUID
-	StartedAt    pgtype.Timestamptz
-	FinishedAt   pgtype.Timestamptz
-	Library      []byte
-	MbidBackfill []byte
-	CoverEnrich  []byte
-	ErrorMessage *string
+	ID              pgtype.UUID
+	StartedAt       pgtype.Timestamptz
+	FinishedAt      pgtype.Timestamptz
+	Library         []byte
+	MbidBackfill    []byte
+	CoverEnrich     []byte
+	ErrorMessage    *string
+	ArtistArtEnrich []byte
 }
 
 type ScrobbleQueue struct {