完善节目平台与直播监控体验

frontend/src/admin/AdminLayout.tsx

@@ -2,7 +2,7 @@ import { useState } from 'react'
 import { Outlet, useNavigate, useLocation } from 'react-router-dom'
 import { Layout, Menu, Button, Typography } from 'antd'
 import {
-  DashboardOutlined, VideoCameraOutlined, PlusOutlined,
+  DashboardOutlined, VideoCameraOutlined, PlusOutlined, MonitorOutlined,
   CloudServerOutlined, SettingOutlined, LogoutOutlined,
 } from '@ant-design/icons'
 import { clearToken } from '../api/client'
@@ -13,6 +13,7 @@ const { Text } = Typography
 
 const menuItems = [
   { key: '/admin', icon: <DashboardOutlined />, label: '概览' },
+  { key: '/admin/board', icon: <MonitorOutlined />, label: '直播看板' },
   { key: '/admin/streams', icon: <VideoCameraOutlined />, label: '节目列表' },
   { key: '/admin/streams/new', icon: <PlusOutlined />, label: '创建节目' },
   { key: '/admin/nodes', icon: <CloudServerOutlined />, label: '边缘节点' },