结构大修改，改成朴实无华的结构，不过度架构。能跑就行

Assets/Scripts/UI/Loading/Loading.cs

@@ -24,7 +24,7 @@ namespace NBF
         //         LoadingPanel.LoadingTask.Add(waitTask);
         //     }
         //
-        //     var panel = App.UI.GetUI<LoadingPanel>();
+        //     var panel = UI.Inst.GetUI<LoadingPanel>();
         //     if (panel is not { IsShowing: true })
         //     {
         //         LoadingPanel.Show(new LoadingShowParam(style, startProgress));