feat: Stream Now instant-play of a random track from the nav button

DeepDrftData/ITrackService.cs

@@ -13,6 +13,12 @@ public interface ITrackService
 {
     Task<ResultContainer<TrackDto?>> GetById(long id);
     Task<ResultContainer<TrackDto?>> GetByEntryKey(string entryKey);
+
+    /// <summary>
+    /// Returns a single track chosen uniformly at random, or null when the library is empty
+    /// (a valid state, not a failure). Backs the public "Stream Now" instant-play feature.
+    /// </summary>
+    Task<ResultContainer<TrackDto?>> GetRandom(CancellationToken cancellationToken = default);
     Task<ResultContainer<List<TrackDto>>> GetAll();
     Task<ResultContainer<PagedResult<TrackDto>>> GetPaged(int pageNumber, int pageSize, string? sortColumn, bool sortDescending, CancellationToken cancellationToken = default);
     Task<ResultContainer<TrackDto>> Create(TrackDto newTrack);