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>

src/App.tsx

@@ -1,6 +1,7 @@
 import { useEffect, useState } from 'react';
 import { Navigate, Route, Routes, useLocation, useNavigate } from 'react-router-dom';
 import { checkAuth, logout, setUnauthorizedHandler } from './api/client';
+import { loadBlockedWords } from './utils/wordFilter';
 import { AuthView } from './components/AuthView';
 import { ChatView } from './components/ChatView';
 import { MindSpaceView } from './components/MindSpaceView';
@@ -130,6 +131,7 @@ export function App() {
       setUser(status.user ?? null);
       setCapabilities(status.capabilities);
       setGrantedSkills(status.grantedSkills);
+      if (status.authenticated) void loadBlockedWords();
     });
     return () => setUnauthorizedHandler(null);
   }, [mindSpacePreview, navigate]);