feat(ratings): skip-to-1★ threshold and mix min-rating filter

Add Ratings section under General: manual skip count before setting 1★,
and per-axis minimum stars for random mixes/albums (song, album, artist).
StarRating shows five stars with selection capped at three; shared max in authStore.
Queue filtering via passesMixMinRatings; OpenSubsonic-style entity rating fields on types.

src/api/subsonic.ts

@@ -81,6 +81,9 @@ export interface SubsonicSong {
   coverArt?: string;
   year?: number;
   userRating?: number;
+  /** Some OpenSubsonic responses attach parent ratings on child songs. */
+  albumUserRating?: number;
+  artistUserRating?: number;
   // Audio technical info
   bitRate?: number;
   suffix?: string;