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/components/AdminLayout.tsx

@@ -3,7 +3,6 @@ import { NavLink, Outlet } from 'react-router-dom';
 const links = [
   { to: '/admin', label: '概览', end: true },
   { to: '/admin/users', label: '用户管理' },
-  { to: '/admin/llm', label: 'LLM 配置' },
   { to: '/admin/billing', label: '账单记录' },
   { to: '/admin/wechat', label: '服务号管理' },
 ];
@@ -13,7 +12,7 @@ export function AdminLayout() {
     <div className="layout">
       <header>
         <h1>超级管理后台</h1>
-        <p style={{ color: '#68716c' }}>用户、计费、LLM 与服务号</p>
+        <p style={{ color: '#68716c' }}>用户、计费与服务号</p>
       </header>
       <nav className="nav">
         <NavLink