纯会话页面添加退出登录功能

- ChatHeader 新增可选 onLogout 回调，传入时在更多菜单中显示退出登录项
- ChatPagePure 中集成 useAuth 的 logout 方法，点击后确认并跳转登录页
- 不影响原有聊天页（未传 onLogout 时不显示）

src/pages/chat/ChatPagePure.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useState, useCallback, useRef } from 'react';
-import { App as AntApp, Empty } from 'antd';
+import { App as AntApp, Empty, Modal } from 'antd';
 import type { ChatPageLogicOutput } from './ChatPageLogic';
 import { markdownToPlainText } from './utils/copy';
 import { useChatPageLogic } from './ChatPageLogic';
@@ -9,6 +9,7 @@ import ChatHeader from './components/ChatHeader';
 import ChatInput from './components/ChatInput';
 import ChatOutline from './components/ChatOutline';
 import type { ModelOverrides } from '../../api';
+import { useAuth } from '../../store/auth';
 import './styles/chat-page-pure.css';
 
 /**
@@ -19,6 +20,7 @@ import './styles/chat-page-pure.css';
 export default function ChatPagePure() {
   const logic = useChatPageLogic();
   const { message } = AntApp.useApp();
+  const { logout } = useAuth();
   const [outlineCollapsed, setOutlineCollapsed] = useState(true);
   const isAutoScrolling = useRef(false);
 
@@ -70,6 +72,17 @@ export default function ChatPagePure() {
     }
   }, [setHighlightId]);
 
+  // 退出登录
+  const handleLogout = () => {
+    Modal.confirm({
+      title: '确定要退出登录吗？',
+      onOk: async () => {
+        await logout();
+        window.location.href = '/login';
+      },
+    });
+  };
+
   return (
     <div className="chat-pure-shell">
       <section className="chat-main">
@@ -89,6 +102,7 @@ export default function ChatPagePure() {
                 onOpenMcp={() => setMcpDrawerOpen(true)}
                 onManageAgent={() => navigate(`/agents/${id}`)}
                 onClear={sender.handleClear}
+                onLogout={handleLogout}
               />
 
               <ChatBody

src/pages/chat/components/ChatHeader.tsx

@@ -1,4 +1,4 @@
-import { ApiOutlined, DeleteOutlined, EditOutlined, SettingOutlined, EllipsisOutlined, HistoryOutlined } from '@ant-design/icons';
+import { ApiOutlined, DeleteOutlined, EditOutlined, SettingOutlined, EllipsisOutlined, HistoryOutlined, LogoutOutlined } from '@ant-design/icons';
 import { Button, Dropdown, Modal, Switch } from 'antd';
 import type { Agent } from '../../../api';
 import './ChatHeader.css';
@@ -37,8 +37,9 @@ export default function ChatHeader(props: {
   onOpenMcp: () => void;
   onManageAgent: () => void;
   onClear: () => void;
+  onLogout?: () => void;
 }) {
-  const { agent, useStream, setUseStream, onOpenHistory, onOpenParams, onOpenMcp, onManageAgent, onClear } = props;
+  const { agent, useStream, setUseStream, onOpenHistory, onOpenParams, onOpenMcp, onManageAgent, onClear, onLogout } = props;
   const modelText = formatAgentModel(agent.model);
 
   return (
@@ -86,7 +87,18 @@ export default function ChatHeader(props: {
                 onClick: () => {
                   Modal.confirm({ title: '清空当前会话所有消息？', onOk: onClear });
                 }
-              }
+              },
+              ...(onLogout
+                ? [
+                    { type: 'divider' as const },
+                    {
+                      key: 'logout',
+                      label: '退出登录',
+                      icon: <LogoutOutlined />,
+                      onClick: onLogout,
+                    }
+                  ]
+                : [])
             ]
           }}
           placement="bottomRight"