fix(dbq): commit the rest of the 0042 regen (Track model + embedders)

The previous commit staged only track_tags.sql.go and left the rest of
the sqlc regen uncommitted, so HEAD referenced TrackTag / the new
tracks.tag_source columns without their definitions — a broken tree.

Adding tracks.tag_source + tag_sources_version to the tracks table
regenerated every generated file that returns/embeds the Track model
(models.go, tracks/events/history/likes/recommendation). Commit them all
together so dev HEAD compiles.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

internal/db/dbq/models.go

@@ -556,21 +556,23 @@ type TasteTuning struct {
 }
 
 type Track struct {
-	ID          pgtype.UUID
-	Title       string
-	AlbumID     pgtype.UUID
-	ArtistID    pgtype.UUID
-	TrackNumber *int32
-	DiscNumber  *int32
-	DurationMs  int32
-	FilePath    string
-	FileSize    int64
-	FileFormat  string
-	Bitrate     *int32
-	Mbid        *string
-	Genre       *string
-	AddedAt     pgtype.Timestamptz
-	UpdatedAt   pgtype.Timestamptz
+	ID                pgtype.UUID
+	Title             string
+	AlbumID           pgtype.UUID
+	ArtistID          pgtype.UUID
+	TrackNumber       *int32
+	DiscNumber        *int32
+	DurationMs        int32
+	FilePath          string
+	FileSize          int64
+	FileFormat        string
+	Bitrate           *int32
+	Mbid              *string
+	Genre             *string
+	AddedAt           pgtype.Timestamptz
+	UpdatedAt         pgtype.Timestamptz
+	TagSource         *string
+	TagSourcesVersion int32
 }
 
 type TrackSimilarity struct {
@@ -581,6 +583,12 @@ type TrackSimilarity struct {
 	FetchedAt pgtype.Timestamptz
 }
 
+type TrackTag struct {
+	TrackID pgtype.UUID
+	Tag     string
+	Weight  float64
+}
+
 type User struct {
 	ID                  pgtype.UUID
 	Username            string