Add smart ACK provider for WeChat MP replies

Replace fixed ackText with a rule-based AckProvider that picks
response templates by message type and intent (translate, summary,
rewrite, poster, ppt, mindmap, code, search, schedule). Pure sync,
zero I/O, auto-falls back to config.ackText on any error.

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

ops/src/App.tsx

@@ -10,7 +10,6 @@ import { ReportsPage } from './pages/ReportsPage';
 import { ReviewPage } from './pages/ReviewPage';
 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';
 
@@ -43,7 +42,6 @@ export function App() {
       >
         <Route index element={<SummaryPage />} />
         <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 />} />