feat: 添加微信SDK和关卡页面，重构预制体结构

- 新增 WxSDK 微信SDK工具类
- 新增 PageLevel 关卡选择页面组件
- 将 prefabs 目录从 resources 移至根目录
- 更新 ViewManager 支持预制体属性引用
- 添加 BaseView 页面基类

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package-lock.json

@@ -0,0 +1,18 @@
+{
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+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "mp-xieyingeng",
+      "dependencies": {
+        "minigame-api-typings": "^3.8.18"
+      }
+    },
+    "node_modules/minigame-api-typings": {
+      "version": "3.8.18",
+      "resolved": "https://mirrors.tencent.com/npm/minigame-api-typings/-/minigame-api-typings-3.8.18.tgz",
+      "integrity": "sha512-EdHRr/3qDfzd5ofylR5gKTAsu+Hrqq4N2ylHG7TfC5BroeQOEPBT1jKNmTYypY7dX9vnbMvIE4iCge7r09NdzA=="
+    }
+  }
+}