Improve WeChat MP replies and ship MindSpace/H5 production updates.

Add WeChat service account routing with sync acks, connectivity tests, and context isolation; document deploy runbooks; and bundle related MindSpace, voice, Plaza, and server gateway changes for production rollout.

Co-authored-by: Cursor <cursoragent@cursor.com>

ops/src/App.tsx

@@ -12,6 +12,7 @@ import { SummaryPage } from './pages/admin/SummaryPage';
 import { UsersPage } from './pages/admin/UsersPage';
 import { LlmPage } from './pages/admin/LlmPage';
 import { BillingPage } from './pages/admin/BillingPage';
+import { WechatPage } from './pages/admin/WechatPage';
 
 export function App() {
   return (
@@ -44,6 +45,7 @@ export function App() {
         <Route path="users" element={<UsersPage />} />
         <Route path="llm" element={<LlmPage />} />
         <Route path="billing" element={<BillingPage />} />
+        <Route path="wechat" element={<WechatPage />} />
         <Route path="*" element={<Navigate to="/admin" replace />} />
       </Route>