Remove dead code: unused storage/transcoder members, Upload table, retry columns, redundant packages

backend/Core/Musify.Application/Contracts/IAudioTranscoderService.cs

@@ -3,6 +3,4 @@ namespace Musify.Application.Contracts;
 public interface IAudioTranscoderService
 {
     public Task<AudioTranscodeResult> TranscodeToAudioFileAsync(Stream audioStream, string destinationPath, CancellationToken cancellationToken);
-
-    public Task<bool> IsValidAudioFileAsync(string filePath, CancellationToken cancellationToken);
 }

backend/Core/Musify.Application/Contracts/IDatabase.cs

@@ -24,8 +24,6 @@ public interface IDatabase
 
     public DbSet<MixItem> MixItems { get; }
 
-    public DbSet<Upload> Uploads { get; }
-
     public DbSet<UploadIntent> UploadIntents { get; }
 
     public DbSet<ListeningHistory> ListeningHistories { get; }

backend/Core/Musify.Application/Contracts/IStorageService.cs

@@ -6,8 +6,6 @@ public interface IStorageService
 
     public Task<ObjectMetaData?> HeadObjectAsync(string bucket, string key, CancellationToken cancellationToken);
 
-    public Task<string> GetUrlAsync(string bucket, string key, TimeSpan ExpirationTime, CancellationToken cancellationToken);
-
     public Task<string> GetUploadUrlAsync(string bucket, string key, string contentType, TimeSpan expirationTime, CancellationToken cancellationToken, bool preventOverwrite = true);
 
     public Task UploadFileAsync(string filePath, string bucket, string key, CancellationToken cancellationToken);
@@ -21,7 +19,5 @@ public interface IStorageService
     public Task CopyFileAsync(string sourceBucket, string sourceKey, string destinationBucket, string destinationKey,
         CancellationToken cancellationToken);
 
-    public Task RemoveFolderAsync(string bucket, string folderKey, CancellationToken cancellationToken);
-
     public IAsyncEnumerable<StorageObject> ListObjectsAsync(string bucket, string prefix, CancellationToken cancellationToken);
 }