🧹 清理重复配置文件

- 删除根目录中重复的 NestJS 配置文件
- 删除 tsconfig.json, tsconfig.build.json, eslint.config.mjs, .prettierrc
- 保留 wwjcloud-nest/ 目录中的完整配置
- 避免配置冲突，确保项目结构清晰

admin-vben/apps/backend-mock/api/demo/bigint.ts

@@ -0,0 +1,28 @@
+export default eventHandler(async (event) => {
+  const userinfo = verifyAccessToken(event);
+  if (!userinfo) {
+    return unAuthorizedResponse(event);
+  }
+  const data = `
+  {
+    "code": 0,
+    "message": "success",
+    "data": [
+              {
+                "id": 123456789012345678901234567890123456789012345678901234567890,
+                "name": "John Doe",
+                "age": 30,
+                "email": "john-doe@demo.com"
+                },
+                {
+                "id": 987654321098765432109876543210987654321098765432109876543210,
+                "name": "Jane Smith",
+                "age": 25,
+                "email": "jane@demo.com"
+                }
+            ]
+  }
+  `;
+  setHeader(event, 'Content-Type', 'application/json');
+  return data;
+});