feat(db/m7-353): sqlc queries for album cover enrichment

internal/db/dbq/system_playlists.sql.go

@@ -201,7 +201,11 @@ type ListPlaylistsByUserAndKindRow struct {
 	UpdatedAt     pgtype.Timestamptz
 }
 
-// Powers GET /api/me/playlists?kind=. Sorted by updated_at DESC.
+// Used in integration tests; production filter applied in Go
+// (api.handleListPlaylists fetches via Service.List and filters by Kind in
+// memory so it can also surface other users' public playlists alongside
+// the caller's own kind-filtered ones).
+// Sorted by updated_at DESC.
 func (q *Queries) ListPlaylistsByUserAndKind(ctx context.Context, arg ListPlaylistsByUserAndKindParams) ([]ListPlaylistsByUserAndKindRow, error) {
 	rows, err := q.db.Query(ctx, listPlaylistsByUserAndKind, arg.UserID, arg.Column2)
 	if err != nil {