Add track status filter and counts, album track ids and bulk track deletion

GET /tracks/users/{userId} accepts repeated status values and returns the
albums each track belongs to. GET /tracks/users/{userId}/status-counts,
GET /albums/{id}/tracks/ids and DELETE /tracks with a list of track ids
are new.

backend/Core/Musify.Application/Tracks/Responses/DeleteTracksResponse.cs

@@ -0,0 +1,6 @@
+namespace Musify.Application.Tracks.Responses
+{
+    public record DeleteTracksResponse(
+        IReadOnlyList<Guid> DeletedTrackIds,
+        IReadOnlyList<Guid> FailedTrackIds);
+}

backend/Core/Musify.Application/Tracks/Responses/TrackProjections.cs

@@ -21,5 +21,25 @@ namespace Musify.Application.Tracks.Responses
                 track.OwnerUserId,
                 track.Tags.Select(tag => tag.Tag).ToList(),
                 track.IsExplicit));
+
+        public static IQueryable<UserTrackApplicationResponse> SelectUserResponse(this IQueryable<Track> query) =>
+            query.Select(track => new UserTrackApplicationResponse(
+                track.Id,
+                track.Title,
+                track.Owner.Name,
+                track.Audio.TranscodeStatus,
+                track.DurationSeconds,
+                track.ListeningHistories.Count(listen => listen.IsCounted),
+                track.CreatedAt,
+                track.UpdatedAt,
+                track.OwnerUserId,
+                track.Tags.Select(tag => tag.Tag).ToList(),
+                track.IsExplicit,
+                track.AlbumTracks
+                    .Where(albumTrack => albumTrack.Album.LifeCycleStatus == LifeCycleStatus.Active)
+                    .OrderBy(albumTrack => albumTrack.AddedAt)
+                    .ThenBy(albumTrack => albumTrack.AlbumId)
+                    .Select(albumTrack => new TrackAlbumReference(albumTrack.AlbumId, albumTrack.Album.Title))
+                    .ToList()));
     }
 }

backend/Core/Musify.Application/Tracks/Responses/TrackStatusCountsResponse.cs

@@ -0,0 +1,9 @@
+namespace Musify.Application.Tracks.Responses
+{
+    public record TrackStatusCountsResponse(
+        int Total,
+        int Pending,
+        int Processing,
+        int Completed,
+        int Failed);
+}

backend/Core/Musify.Application/Tracks/Responses/UserTrackApplicationResponse.cs

@@ -0,0 +1,20 @@
+using Musify.Domain.ValueObjects;
+
+namespace Musify.Application.Tracks.Responses
+{
+    public record TrackAlbumReference(Guid Id, string Title);
+
+    public record UserTrackApplicationResponse(
+        Guid Id,
+        string Title,
+        string? Artist,
+        ProcessingStatus AudioStatus,
+        double Duration,
+        int ListensCount,
+        DateTime CreatedAt,
+        DateTime UpdatedAt,
+        long OwnerUserId,
+        IReadOnlyCollection<Genre> Tags,
+        bool IsExplicit,
+        IReadOnlyList<TrackAlbumReference> Albums);
+}