🧹 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

package.json

@@ -1,17 +0,0 @@
-{
-  "scripts": {
-    "contracts:extract": "node tools/extract-admin-routes.js",
-    "contracts:compare": "node tools/compare-admin-routes.js",
-    "check:routes": "node tools/check-routes.js",
-    "gen:controllers": "node tools/gen-controllers.js"
-  },
-  "dependencies": {
-    "@nestjs/terminus": "^11.0.0",
-    "alipay-sdk": "^4.14.0",
-    "axios": "^1.11.0",
-    "wechatpay-node-v3": "^2.2.1"
-  },
-  "devDependencies": {
-    "typescript": "^5.9.2"
-  }
-}