feat(web): migrate course catalogue

web-react/src/layout/AppShell.tsx

@@ -69,6 +69,7 @@ export default function AppShell() {
     { key: '/dashboard', icon: <AppstoreOutlined />, label: isStudentHome ? '学习首页' : isTeacherHome ? '教学工作台' : '教务总览' },
     { key: '/account', icon: <IdcardOutlined />, label: '个人账户' },
     { key: '/notifications', icon: <BellOutlined />, label: '通知中心' },
+    { key: '/courses', icon: <BookOutlined />, label: '课程库' },
     ...((roles.includes('Student') || roles.includes('Teacher'))
       ? [{ key: '/my-timetable', icon: <CalendarOutlined />, label: '我的课表' }]
       : []),