feat: add release asset upload and cleanup to SyncService

Services/ReleaseAssetDownloadService.cs

@@ -11,4 +11,9 @@ public class ReleaseAssetDownloadService(HttpClient httpClient)
         await resource.CopyToAsync(fs, 8192);
         return filePath;
     }
+
+    public async Task DeleteReleaseAssetAsync(string downloadPath)
+    {
+        File.Delete(downloadPath);
+    }
 }