diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 06402c75..6085132b 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -16000,9 +16000,9 @@
       }
     },
     "node_modules/typescript": {
-      "version": "6.0.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-6.0.2.tgz",
-      "integrity": "sha512-bGdAIrZ0wiGDo5l8c++HWtbaNCWTS4UTv7RaTH/ThVIgjkveJt83m74bBHMJkuCbslY8ixgLBVZJIOiQlQTjfQ==",
+      "version": "4.9.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.9.5.tgz",
+      "integrity": "sha512-1FXk9E2Hm+QzZQ7z+McJiHL4NW1F2EzMu9Nq9i3zAaGqibafqYwCVU6WyWAuyQRRzOlxou8xZSyXLEN8oKj24g==",
       "license": "Apache-2.0",
       "peer": true,
       "bin": {
@@ -16010,7 +16010,7 @@
         "tsserver": "bin/tsserver"
       },
       "engines": {
-        "node": ">=14.17"
+        "node": ">=4.2.0"
       }
     },
     "node_modules/unbox-primitive": {
diff --git a/frontend/src/App.js b/frontend/src/App.js
index ab539aad..cf76a624 100644
--- a/frontend/src/App.js
+++ b/frontend/src/App.js
@@ -4,28 +4,24 @@ import axios from 'axios';
 
 const API_BASE = 'http://localhost:8000/api/v1';
 
-// 配置 axios 默认头
 axios.interceptors.request.use(config => {
   const token = localStorage.getItem('token');
-  if (token) {
-    config.headers.Authorization = `Bearer ${token}`;
-  }
+  if (token) config.headers.Authorization = `Bearer ${token}`;
   return config;
 });
 
 // ============ 登录页面 ============
 function LoginPage() {
-  const [username, setUsername] = useState('');
-  const [password, setPassword] = useState('');
+  const [username, setUsername] = useState('test');
+  const [password, setPassword] = useState('test123');
   const navigate = useNavigate();
 
   const handleLogin = async (e) => {
     e.preventDefault();
     try {
-      const response = await axios.post(`${API_BASE}/auth/login/`, { username, password });
-      const token = response.data.token;
-      localStorage.setItem('token', token);
-      localStorage.setItem('user', JSON.stringify(response.data.user));
+      const res = await axios.post(`${API_BASE}/auth/login/`, { username, password });
+      localStorage.setItem('token', res.data.token);
+      localStorage.setItem('user', JSON.stringify(res.data.user));
       navigate('/meetings');
     } catch (error) {
       alert('登录失败：' + (error.response?.data?.detail || error.message));
@@ -33,35 +29,20 @@ function LoginPage() {
   };
 
   return (
-    <div style={styles.container}>
+    <div style={styles.center}>
       <div style={styles.card}>
         <h1 style={styles.title}>🏛️ 龙虾议事厅</h1>
         <form onSubmit={handleLogin} style={styles.form}>
-          <input
-            type="text"
-            placeholder="用户名"
-            value={username}
-            onChange={(e) => setUsername(e.target.value)}
-            style={styles.input}
-            required
-          />
-          <input
-            type="password"
-            placeholder="密码"
-            value={password}
-            onChange={(e) => setPassword(e.target.value)}
-            style={styles.input}
-            required
-          />
-          <button type="submit" style={styles.button}>登录</button>
+          <input type="text" placeholder="用户名" value={username} onChange={e => setUsername(e.target.value)} style={styles.input} required />
+          <input type="password" placeholder="密码" value={password} onChange={e => setPassword(e.target.value)} style={styles.input} required />
+          <button type="submit" style={styles.btn}>登录</button>
         </form>
-        <p style={styles.hint}>提示：首次使用请先注册超级用户</p>
       </div>
     </div>
   );
 }
 
-// ============ 会议列表页面 ============
+// ============ 会议列表 ============
 function MeetingList() {
   const [meetings, setMeetings] = useState([]);
   const [topic, setTopic] = useState('');
@@ -69,92 +50,50 @@ function MeetingList() {
   const token = localStorage.getItem('token');
 
   useEffect(() => {
-    if (!token) {
-      navigate('/login');
-      return;
-    }
+    if (!token) { navigate('/login'); return; }
     fetchMeetings();
   }, []);
 
   const fetchMeetings = async () => {
     try {
-      const response = await axios.get(`${API_BASE}/meetings/`, {
-        headers: { Authorization: `Bearer ${token}` }
-      });
-      setMeetings(response.data);
-    } catch (error) {
-      console.error('获取会议失败:', error);
-    }
+      const res = await axios.get(`${API_BASE}/meetings/`);
+      setMeetings(res.data);
+    } catch (error) { console.error(error); }
   };
 
   const createMeeting = async (e) => {
     e.preventDefault();
     try {
-      const response = await axios.post(
-        `${API_BASE}/meetings/`,
-        { topic },
-        { headers: { Authorization: `Bearer ${token}` } }
-      );
-      navigate(`/meeting/${response.data.id}`);
+      const res = await axios.post(`${API_BASE}/meetings/`, { topic });
+      navigate(`/meeting/${res.data.id}`);
     } catch (error) {
       alert('创建失败：' + (error.response?.data?.detail || error.message));
     }
   };
 
-  const joinMeeting = async (meetingId) => {
-    const inviteCode = prompt('请输入邀请码:');
-    if (!inviteCode) return;
-
-    try {
-      await axios.post(
-        `${API_BASE}/meetings/${meetingId}/join/`,
-        { invite_code: inviteCode },
-        { headers: { Authorization: `Bearer ${token}` } }
-      );
-      navigate(`/meeting/${meetingId}`);
-    } catch (error) {
-      alert('加入失败：' + (error.response?.data?.error || error.message));
-    }
-  };
-
-  const logout = () => {
-    localStorage.removeItem('token');
-    navigate('/login');
-  };
+  const logout = () => { localStorage.removeItem('token'); navigate('/login'); };
 
   return (
     <div style={styles.container}>
       <div style={styles.header}>
-        <h1 style={styles.title}>🏛️ 我的会议室</h1>
-        <button onClick={logout} style={styles.logoutBtn}>退出</button>
+        <h1>📋 我的会议室</h1>
+        <button onClick={logout} style={styles.smallBtn}>退出</button>
       </div>
-
       <div style={styles.card}>
-        <h2>创建新会议</h2>
+        <h2>创建会议</h2>
         <form onSubmit={createMeeting} style={styles.form}>
-          <input
-            type="text"
-            placeholder="会议主题"
-            value={topic}
-            onChange={(e) => setTopic(e.target.value)}
-            style={styles.input}
-            required
-          />
-          <button type="submit" style={styles.button}>创建</button>
+          <input type="text" placeholder="会议主题" value={topic} onChange={e => setTopic(e.target.value)} style={styles.input} required />
+          <button type="submit" style={styles.btn}>创建</button>
         </form>
       </div>
-
-      <div style={styles.meetingList}>
-        {meetings.map(meeting => (
-          <div key={meeting.id} style={styles.meetingCard}>
+      <div style={styles.list}>
+        {meetings.map(m => (
+          <div key={m.id} style={styles.item}>
             <div>
-              <h3>{meeting.topic}</h3>
-              <p>状态：{meeting.status} | 参会：{meeting.participant_count} | 邀请码：{meeting.invite_code}</p>
-            </div>
-            <div>
-              <button onClick={() => navigate(`/meeting/${meeting.id}`)} style={styles.smallBtn}>进入</button>
-              <button onClick={() => joinMeeting(meeting.id)} style={styles.smallBtn}>加入</button>
+              <h3>{m.topic}</h3>
+              <p>状态：{m.status} | 邀请码：{m.invite_code}</p>
             </div>
+            <button onClick={() => navigate(`/meeting/${m.id}`)} style={styles.smallBtn}>进入</button>
           </div>
         ))}
       </div>
@@ -162,58 +101,50 @@ function MeetingList() {
   );
 }
 
-// ============ 会议室页面 ============
+// ============ 会议室 ============
 function MeetingRoom() {
   const { id } = useParams();
   const [messages, setMessages] = useState([]);
   const [content, setContent] = useState('');
   const [participants, setParticipants] = useState([]);
-  const [lastId, setLastId] = useState(0);
+  const [meeting, setMeeting] = useState(null);
   const token = localStorage.getItem('token');
 
   useEffect(() => {
     if (!token) return;
+    fetchMeeting();
     fetchParticipants();
     fetchMessages();
-    
-    // 1 秒轮询新消息
     const interval = setInterval(fetchMessages, 1000);
     return () => clearInterval(interval);
-  }, []);
+  }, [id]);
+
+  const fetchMeeting = async () => {
+    try {
+      const res = await axios.get(`${API_BASE}/meetings/${id}/`);
+      setMeeting(res.data);
+    } catch (error) { console.error(error); }
+  };
 
   const fetchParticipants = async () => {
     try {
-      const response = await axios.get(`${API_BASE}/meetings/${id}/participants/`, {
-        headers: { Authorization: `Bearer ${token}` }
-      });
-      setParticipants(response.data);
-    } catch (error) {
-      console.error('获取参会者失败:', error);
-    }
+      const res = await axios.get(`${API_BASE}/meetings/${id}/participants/`);
+      setParticipants(res.data);
+    } catch (error) { console.error(error); }
   };
 
   const fetchMessages = async () => {
     try {
-      const response = await axios.get(`${API_BASE}/meetings/${id}/messages/?last_id=${lastId}`, {
-        headers: { Authorization: `Bearer ${token}` }
-      });
-      if (response.data.messages.length > 0) {
-        setMessages(prev => [...prev, ...response.data.messages]);
-        setLastId(response.data.messages[response.data.messages.length - 1].id);
-      }
-    } catch (error) {
-      console.error('获取消息失败:', error);
-    }
+      const res = await axios.get(`${API_BASE}/meetings/${id}/messages/?last_id=0`);
+      setMessages(res.data.messages || []);
+    } catch (error) { console.error(error); }
   };
 
   const sendMessage = async (e) => {
     e.preventDefault();
+    if (!content.trim()) return;
     try {
-      await axios.post(
-        `${API_BASE}/meetings/${id}/send_message/`,
-        { content },
-        { headers: { Authorization: `Bearer ${token}` } }
-      );
+      await axios.post(`${API_BASE}/meetings/${id}/send_message/`, { content });
       setContent('');
       fetchMessages();
     } catch (error) {
@@ -221,48 +152,119 @@ function MeetingRoom() {
     }
   };
 
+  const mentionAgent = async () => {
+    const targetAgentId = prompt('@哪个 Agent？输入 agent_id:');
+    if (!targetAgentId || !content.trim()) return;
+    try {
+      await axios.post(`${API_BASE}/meetings/${id}/mention_agent/`, {
+        target_agent_id: targetAgentId, content,
+        sender_name: localStorage.getItem('user') ? JSON.parse(localStorage.getItem('user')).username : 'User'
+      });
+      setContent('');
+      fetchMessages();
+      alert(`✅ 已 @${targetAgentId}`);
+    } catch (error) {
+      alert('发送失败：' + (error.response?.data?.error || error.message));
+    }
+  };
+
+  const startMeeting = async () => {
+    try {
+      await axios.post(`${API_BASE}/meetings/${id}/start/`);
+      fetchMeeting();
+      alert('✅ 会议已开始');
+    } catch (error) {
+      alert('开始失败：' + (error.response?.data?.error || error.message));
+    }
+  };
+
+  const endMeeting = async () => {
+    if (!confirm('确定结束会议？')) return;
+    try {
+      await axios.post(`${API_BASE}/meetings/${id}/end/`);
+      fetchMeeting();
+      alert('✅ 会议已结束');
+    } catch (error) {
+      alert('结束失败：' + (error.response?.data?.error || error.message));
+    }
+  };
+
+  const generateMinutes = async () => {
+    try {
+      const res = await axios.get(`${API_BASE}/meetings/${id}/minutes/?output=markdown`);
+      const blob = new Blob([res.data.markdown], { type: 'text/markdown' });
+      const url = URL.createObjectURL(blob);
+      const a = document.createElement('a');
+      a.href = url;
+      a.download = `meeting-${id.slice(0, 8)}.md`;
+      a.click();
+      URL.revokeObjectURL(url);
+      alert('✅ 纪要已导出');
+    } catch (error) {
+      alert('导出失败：' + error.message);
+    }
+  };
+
   return (
     <div style={styles.container}>
       <div style={styles.header}>
-        <Link to="/meetings" style={styles.backLink}>← 返回</Link>
-        <h1 style={styles.title}>🏛️ 会议室</h1>
-        <div style={styles.participants}>
+        <Link to="/meetings" style={styles.link}>← 返回</Link>
+        <h1>{meeting?.topic || '会议室'}</h1>
+        {meeting && <span style={styles.badge}>{meeting.status}</span>}
+      </div>
+
+      {meeting && (
+        <div style={styles.infoCard}>
+          <p><strong>ID:</strong> {meeting.id}</p>
+          <p><strong>邀请码:</strong> {meeting.invite_code}</p>
+          <div style={styles.btnGroup}>
+            <button onClick={startMeeting} style={styles.btnGreen}>▶️ 开始</button>
+            <button onClick={endMeeting} style={styles.btnRed}>⏹️ 结束</button>
+            <button onClick={generateMinutes} style={styles.btnBlue}>📋 纪要</button>
+          </div>
+        </div>
+      )}
+
+      {/* 座位图 */}
+      <div style={styles.card}>
+        <h2>🪑 座位图 <span style={styles.badge}>{participants.length}</span></h2>
+        <div style={styles.seats}>
           {participants.map(p => (
-            <span key={p.id} style={styles.participant}>
-              {p.agent_emoji} {p.nickname}
-            </span>
+            <div key={p.id} style={styles.seat}>
+              <div style={styles.seatEmoji}>{p.agent_emoji || '👤'}</div>
+              <div style={styles.seatName}>{p.nickname}</div>
+              {p.is_host && <div style={styles.hostBadge}>👑</div>}
+            </div>
           ))}
         </div>
       </div>
 
-      <div style={styles.chatContainer}>
+      {/* 聊天 */}
+      <div style={styles.card}>
+        <h2>💬 聊天 <span style={styles.badge}>{messages.length}</span></h2>
         <div style={styles.messages}>
           {messages.map(msg => (
-            <div key={msg.id} style={styles.message}>
-              <strong>{msg.sender_emoji} {msg.sender_name}</strong>
-              <span style={styles.time}>{new Date(msg.created_at).toLocaleTimeString()}</span>
-              <p>{msg.content}</p>
+            <div key={msg.id} style={styles.msg}>
+              <div style={styles.msgHeader}>
+                <strong>{msg.sender_emoji} {msg.sender_name}</strong>
+                <span style={styles.msgTime}>{new Date(msg.created_at).toLocaleTimeString()}</span>
+              </div>
+              <p style={styles.msgContent}>{msg.content}</p>
+              {msg.in_reply_to && <div style={styles.replyTag}>↩️ 回复 #{msg.in_reply_to}</div>}
             </div>
           ))}
         </div>
-
         <form onSubmit={sendMessage} style={styles.form}>
-          <input
-            type="text"
-            placeholder="输入消息..."
-            value={content}
-            onChange={(e) => setContent(e.target.value)}
-            style={styles.input}
-            required
-          />
-          <button type="submit" style={styles.button}>发送</button>
+          <input type="text" placeholder="输入消息..." value={content} onChange={e => setContent(e.target.value)} style={styles.input} />
+          <button type="submit" style={styles.btn}>发送</button>
+          <button type="button" onClick={mentionAgent} style={styles.btnPink}>📍 @Agent</button>
         </form>
       </div>
     </div>
   );
 }
 
-// ============ 主应用 ============
+// ============ App ============
 function App() {
   return (
     <Router>
@@ -278,126 +280,36 @@ function App() {
 
 // ============ 样式 ============
 const styles = {
-  container: {
-    maxWidth: '1200px',
-    margin: '0 auto',
-    padding: '20px',
-    fontFamily: '-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif'
-  },
-  header: {
-    display: 'flex',
-    alignItems: 'center',
-    gap: '20px',
-    marginBottom: '20px'
-  },
-  title: {
-    margin: '0',
-    color: '#1a365d'
-  },
-  card: {
-    background: 'white',
-    borderRadius: '12px',
-    padding: '20px',
-    marginBottom: '20px',
-    boxShadow: '0 4px 6px rgba(0,0,0,0.1)'
-  },
-  form: {
-    display: 'flex',
-    gap: '10px',
-    marginBottom: '15px'
-  },
-  input: {
-    flex: 1,
-    padding: '12px',
-    border: '2px solid #e2e8f0',
-    borderRadius: '8px',
-    fontSize: '1em'
-  },
-  button: {
-    padding: '12px 24px',
-    background: 'linear-gradient(135deg, #667eea 0%, #764ba2 100%)',
-    color: 'white',
-    border: 'none',
-    borderRadius: '8px',
-    cursor: 'pointer',
-    fontSize: '1em',
-    fontWeight: '600'
-  },
-  logoutBtn: {
-    marginLeft: 'auto',
-    padding: '8px 16px',
-    background: '#edf2f7',
-    border: 'none',
-    borderRadius: '6px',
-    cursor: 'pointer'
-  },
-  meetingList: {
-    display: 'flex',
-    flexDirection: 'column',
-    gap: '15px'
-  },
-  meetingCard: {
-    background: 'white',
-    borderRadius: '12px',
-    padding: '20px',
-    display: 'flex',
-    justifyContent: 'space-between',
-    alignItems: 'center',
-    boxShadow: '0 4px 6px rgba(0,0,0,0.1)'
-  },
-  smallBtn: {
-    padding: '8px 16px',
-    background: '#4299e1',
-    color: 'white',
-    border: 'none',
-    borderRadius: '6px',
-    cursor: 'pointer',
-    marginLeft: '10px'
-  },
-  chatContainer: {
-    background: 'white',
-    borderRadius: '12px',
-    padding: '20px',
-    boxShadow: '0 4px 6px rgba(0,0,0,0.1)'
-  },
-  messages: {
-    maxHeight: '500px',
-    overflowY: 'auto',
-    marginBottom: '20px'
-  },
-  message: {
-    padding: '15px',
-    background: '#f7fafc',
-    borderRadius: '8px',
-    marginBottom: '10px'
-  },
-  time: {
-    fontSize: '0.8em',
-    color: '#718096',
-    marginLeft: '10px'
-  },
-  participants: {
-    display: 'flex',
-    gap: '10px',
-    marginLeft: 'auto'
-  },
-  participant: {
-    background: '#edf2f7',
-    padding: '6px 12px',
-    borderRadius: '20px',
-    fontSize: '0.9em'
-  },
-  backLink: {
-    color: '#4299e1',
-    textDecoration: 'none',
-    fontSize: '1.1em'
-  },
-  hint: {
-    color: '#718096',
-    fontSize: '0.9em',
-    textAlign: 'center',
-    marginTop: '15px'
-  }
+  center: { display: 'flex', justifyContent: 'center', alignItems: 'center', minHeight: '100vh', background: 'linear-gradient(135deg, #667eea 0%, #764ba2 100%)' },
+  container: { maxWidth: '900px', margin: '0 auto', padding: '20px', fontFamily: '-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif' },
+  header: { display: 'flex', alignItems: 'center', gap: '15px', marginBottom: '20px' },
+  card: { background: 'white', borderRadius: '12px', padding: '20px', marginBottom: '20px', boxShadow: '0 4px 6px rgba(0,0,0,0.1)' },
+  infoCard: { background: '#e7f3ff', border: '1px solid #2196f3', borderRadius: '12px', padding: '15px', marginBottom: '20px' },
+  title: { margin: '0 0 20px', color: '#1a365d', textAlign: 'center' },
+  form: { display: 'flex', gap: '10px' },
+  input: { flex: 1, padding: '12px', border: '2px solid #e2e8f0', borderRadius: '8px', fontSize: '14px' },
+  btn: { padding: '12px 20px', background: 'linear-gradient(135deg, #667eea 0%, #764ba2 100%)', color: 'white', border: 'none', borderRadius: '8px', cursor: 'pointer', fontWeight: '600' },
+  btnGreen: { padding: '8px 16px', background: 'linear-gradient(135deg, #11998e 0%, #38ef7d 100%)', color: 'white', border: 'none', borderRadius: '6px', cursor: 'pointer', marginRight: '8px' },
+  btnRed: { padding: '8px 16px', background: 'linear-gradient(135deg, #eb3349 0%, #f45c43 100%)', color: 'white', border: 'none', borderRadius: '6px', cursor: 'pointer', marginRight: '8px' },
+  btnBlue: { padding: '8px 16px', background: 'linear-gradient(135deg, #4facfe 0%, #00f2fe 100%)', color: 'white', border: 'none', borderRadius: '6px', cursor: 'pointer' },
+  btnPink: { padding: '8px 16px', background: 'linear-gradient(135deg, #f093fb 0%, #f5576c 100%)', color: 'white', border: 'none', borderRadius: '6px', cursor: 'pointer' },
+  smallBtn: { padding: '8px 16px', background: '#edf2f7', border: 'none', borderRadius: '6px', cursor: 'pointer' },
+  list: { display: 'flex', flexDirection: 'column', gap: '15px' },
+  item: { background: 'white', borderRadius: '12px', padding: '20px', display: 'flex', justifyContent: 'space-between', alignItems: 'center', boxShadow: '0 4px 6px rgba(0,0,0,0.1)' },
+  link: { color: '#4299e1', textDecoration: 'none', fontSize: '16px' },
+  badge: { background: '#667eea', color: 'white', padding: '4px 10px', borderRadius: '20px', fontSize: '12px', fontWeight: '600' },
+  btnGroup: { display: 'flex', marginTop: '10px' },
+  seats: { display: 'flex', flexWrap: 'wrap', gap: '15px', justifyContent: 'center' },
+  seat: { background: 'linear-gradient(135deg, #667eea 0%, #764ba2 100%)', color: 'white', padding: '15px', borderRadius: '50%', width: '90px', height: '90px', display: 'flex', flexDirection: 'column', alignItems: 'center', justifyContent: 'center', textAlign: 'center' },
+  seatEmoji: { fontSize: '28px', marginBottom: '5px' },
+  seatName: { fontSize: '12px', fontWeight: '600' },
+  hostBadge: { fontSize: '10px', opacity: '0.8' },
+  messages: { maxHeight: '400px', overflowY: 'auto', marginBottom: '15px' },
+  msg: { padding: '12px', background: '#f7fafc', borderRadius: '8px', marginBottom: '10px' },
+  msgHeader: { display: 'flex', justifyContent: 'space-between', marginBottom: '5px' },
+  msgContent: { margin: '5px 0', color: '#4a5568' },
+  msgTime: { fontSize: '12px', color: '#a0aec0' },
+  replyTag: { fontSize: '11px', color: '#a0aec0', marginTop: '5px' }
 };
 
 export default App;