feat: 小程序移除管理后台入口，新增admin-web前端项目

将管理后台功能从微信小程序中剥离，独立为Vue.js前端项目admin-web

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

miniprogram/app.json

@@ -7,11 +7,7 @@
     "pages/profile/index",
     "pages/login/index",
     "pages/register/index",
-    "pages/batch/index",
-    "pages/admin-dashboard/index",
-    "pages/admin-review/index",
-    "pages/admin-users/index",
-    "pages/admin-samples/index"
+    "pages/batch/index"
   ],
   "window": {
     "navigationBarTitleText": "内容风控平台",