Preserve MediaSources metadata for local tracks in playlists to show bitrate

allstarr/Models/Domain/Song.cs

@@ -99,4 +99,10 @@ public class Song
     /// 0 = Naturally clean, 1 = Explicit, 2 = Not applicable, 3 = Clean/edited version, 6/7 = Unknown
     /// </summary>
     public int? ExplicitContentLyrics { get; set; }
+    
+    /// <summary>
+    /// Raw Jellyfin metadata (MediaSources, etc.) for local tracks
+    /// Preserved to maintain bitrate and other technical details
+    /// </summary>
+    public Dictionary<string, object?>? JellyfinMetadata { get; set; }
 }