refactor: 清理废弃资源并优化预制件配置

1.  删除旧的auie系列预制件、图片资源及元数据
2.  更新精灵帧引用和图集配置
3.  调整buff预制件节点结构和动画时长
4.  优化UI控件的渲染属性和布局参数

assets/resources/gui/element/bigbg.prefab.meta

@@ -0,0 +1,13 @@
+{
+  "ver": "1.1.50",
+  "importer": "prefab",
+  "imported": true,
+  "uuid": "efc14527-e83e-4ced-aeb6-e423e81efee9",
+  "files": [
+    ".json"
+  ],
+  "subMetas": {},
+  "userData": {
+    "syncNodeName": "bigbg"
+  }
+}