Add shuffle dashboard with cost tracking and daily generation limits.

Player settings panel, stats API, and README document how saved and new tracks mix under a per-day Lyria cap.

Co-authored-by: Cursor <cursoragent@cursor.com>

settings.json

@@ -47,7 +47,21 @@
     "variety": true,
     "default_length": "1-2 minutes"
   },
+  "playback": {
+    "shuffle": true,
+    "mix_existing_and_new": true,
+    "new_song_chance": 0.35
+  },
+  "limits": {
+    "max_new_songs_per_day": 10
+  },
+  "costs": {
+    "lyria_pro_usd": 0.08,
+    "lyria_clip_usd": 0.04,
+    "deepseek_per_track_usd": 0.002
+  },
   "lyria": {
-    "prefer_instrumental": true
+    "prefer_instrumental": true,
+    "model": "lyria-3-pro-preview"
   }
 }