feat: classroom status filter + export button + menu (departments/notifications)

apps/admin/src/layouts/MainLayout.tsx

@@ -24,6 +24,7 @@ import {
   KeyOutlined,
   CheckCircleOutlined,
   LaptopOutlined,
+  BellOutlined,
 } from '@ant-design/icons';
 import { usePermission } from '../hooks/usePermission';
 import NotificationBell from '../components/NotificationBell';
@@ -107,6 +108,8 @@ const allMenuItems: MenuItemType[] = [
     label: '系统管理',
     permission: 'log:view',
     children: [
+      { key: '/departments', icon: <HomeOutlined />, label: '校区/部门', permission: 'department:view' },
+      { key: '/notifications', icon: <BellOutlined />, label: '通知中心', permission: 'notification:view' },
       { key: '/operation-logs', icon: <AuditOutlined />, label: '操作日志', permission: 'log:view' },
       { key: '/roles', icon: <SafetyOutlined />, label: '角色管理', permission: 'role:view' },
       { key: '/permissions', icon: <KeyOutlined />, label: '权限一览', permission: 'role:view' },