refactor(server/sql): unify *ForUser track queries via nullable user_id (A1)

internal/subsonic/browse.go

@@ -180,7 +180,7 @@ func (b *browseHandlers) getAlbum(w http.ResponseWriter, r *http.Request) {
 		WriteFail(w, r, ErrGeneric, "Failed to load album artist")
 		return
 	}
-	tracks, err := q.ListTracksByAlbum(r.Context(), id)
+	tracks, err := q.ListTracksByAlbum(r.Context(), dbq.ListTracksByAlbumParams{AlbumID: id})
 	if err != nil {
 		WriteFail(w, r, ErrGeneric, "Failed to load tracks")
 		return
@@ -377,7 +377,7 @@ func (b *browseHandlers) search3(w http.ResponseWriter, r *http.Request) {
 	if songCount > 0 {
 		tracks, err := q.SearchTracks(r.Context(), dbq.SearchTracksParams{
 			Column1: needle, Limit: int32(songCount), Offset: int32(songOffset),
-		})
+		}) // UserID left zero (NULL) — Subsonic has no per-user quarantine context
 		if err != nil {
 			WriteFail(w, r, ErrGeneric, "Song search failed")
 			return

internal/subsonic/stream.go

@@ -140,7 +140,7 @@ func resolveAlbumCoverPath(ctx context.Context, q *dbq.Queries, album dbq.Album)
 			return *album.CoverArtPath
 		}
 	}
-	tracks, err := q.ListTracksByAlbum(ctx, album.ID)
+	tracks, err := q.ListTracksByAlbum(ctx, dbq.ListTracksByAlbumParams{AlbumID: album.ID})
 	if err != nil || len(tracks) == 0 {
 		return ""
 	}