Changes on packages

backend/Core/Musify.Infrastructure/Services/SingleFlightCache.cs

@@ -16,7 +16,7 @@ namespace Musify.Infrastructure.Services
             if (duration <= TimeSpan.Zero)
                 return await factory();
 
-            if (cache.TryGetValue(key, out TValue? cached) && cached is not null)
+            if (cache.TryGetValue(key, out TValue? cached) && cached != null)
                 return cached;
 
             var pending = (Lazy<Task<ErrorOr<TValue>>>)inFlight.GetOrAdd(

backend/Core/Musify.Infrastructure/Services/StorageService.cs

@@ -276,7 +276,7 @@ namespace Musify.Infrastructure.Services
             {
                 listResponse = await amazonS3.ListObjectsV2Async(listRequest, cancellationToken);
 
-                if (listResponse.S3Objects is null or { Count: 0 } )
+                if (listResponse.S3Objects == null|| listResponse.S3Objects.Count == 0)
                     break;
 
                 var deleteRequest = new DeleteObjectsRequest
@@ -289,9 +289,6 @@ namespace Musify.Infrastructure.Services
 
                 var deleteResponse = await amazonS3.DeleteObjectsAsync(deleteRequest, cancellationToken);
 
-                // Some S3-compatible backends (SeaweedFS included) omit the <Error> list from the
-                // XML response entirely when nothing failed, which the SDK deserializes as null
-                // rather than an empty list — real AWS S3 always returns a (possibly empty) list.
                 var deleteErrors = deleteResponse.DeleteErrors ?? [];
                 if (deleteErrors.Count > 0)
                 {

backend/Core/Musify.Infrastructure/Services/StreamTicketService.cs

@@ -29,9 +29,9 @@ namespace Musify.Infrastructure.Services
             var now = DateTimeOffset.UtcNow;
 
             var claims = new Dictionary<string, object> { ["prefix"] = keyPrefix };
-            if (userId is not null)
+            if (userId != null)
                 claims["sub"] = userId.Value.ToString();
-            if (maxBytes is not null)
+            if (maxBytes != null)
                 claims["maxBytes"] = maxBytes.Value.ToString();
 
             var descriptor = new SecurityTokenDescriptor