feat(web): migrate student academic insights

Add React exam and invigilation schedules, student transcript metrics and score breakdowns, and academic warning acknowledgement with support follow-up timelines. Connect role-aware navigation and dashboard links.

web-react/src/layout/AppShell.tsx

@@ -8,6 +8,9 @@ import {
   MenuUnfoldOutlined,
   SafetyCertificateOutlined,
   CalendarOutlined,
+  FileDoneOutlined,
+  ReadOutlined,
+  WarningOutlined,
 } from '@ant-design/icons'
 import { Avatar, Badge, Button, Layout, Menu, Tag } from 'antd'
 import { useQuery } from '@tanstack/react-query'
@@ -44,6 +47,13 @@ export default function AppShell() {
     ...((roles.includes('Student') || roles.includes('Teacher'))
       ? [{ key: '/my-timetable', icon: <CalendarOutlined />, label: '我的课表' }]
       : []),
+    ...((roles.includes('Student') || roles.includes('Teacher'))
+      ? [{ key: '/exams', icon: <FileDoneOutlined />, label: roles.includes('Teacher') ? '监考安排' : '考试安排' }]
+      : []),
+    ...(isStudentHome ? [
+      { key: '/grades', icon: <ReadOutlined />, label: '我的成绩' },
+      { key: '/warnings', icon: <WarningOutlined />, label: '学业预警' },
+    ] : []),
     ...(user?.roles.includes('SuperAdmin')
       ? [{ key: '/users', icon: <SafetyCertificateOutlined />, label: '用户与权限' }]
       : []),