feat: integrate CampusSwitcher into header and API interceptor

apps/admin/src/api/index.ts

@@ -10,6 +10,10 @@ api.interceptors.request.use((config) => {
   if (token) {
     config.headers.Authorization = `Bearer ${token}`;
   }
+  const campusId = localStorage.getItem('currentCampusId');
+  if (campusId) {
+    config.headers['X-Campus-Id'] = campusId;
+  }
   return config;
 });
 

apps/admin/src/layouts/MainLayout.tsx

@@ -27,6 +27,7 @@ import {
 } from '@ant-design/icons';
 import { usePermission } from '../hooks/usePermission';
 import NotificationBell from '../components/NotificationBell';
+import CampusSwitcher from '../components/CampusSwitcher';
 
 const { Header, Sider, Content } = Layout;
 
@@ -265,6 +266,7 @@ const MainLayout: React.FC = () => {
               )
             }
             onClick={() => (isMobile || isTablet ? setDrawerOpen(true) : setCollapsed(!collapsed))}
+          {isDesktop && <CampusSwitcher />}
           <div style={{ display: 'flex', alignItems: 'center', gap: 16 }}>
             <NotificationBell />
             <Dropdown