规范命名空间

具体来说就是 SepCore 开头，然后接所属的模块名，比如 SepCore.Entity，SepCore.Simulation，SepCore.Procedure

Assets/GameMain/Scripts/Runtime/BuiltinComponent/AsyncTask/DownloadAsyncExtension.cs

@@ -1,10 +1,9 @@
-using System;
 using Cysharp.Threading.Tasks;
-using GameFramework;
-using GameFramework.Download;
 using UnityGameFramework.Runtime;
+using DownloadFailureEventArgs = UnityGameFramework.Runtime.DownloadFailureEventArgs;
+using DownloadSuccessEventArgs = UnityGameFramework.Runtime.DownloadSuccessEventArgs;
 
-namespace UnityGameFramework.Runtime.AsyncTask
+namespace SepCore.AsyncTask
 {
     /// <summary>
     /// Download 异步扩展方法