feat: P2-12 Teacher profile/workspace + P2-13 Multi-class comparison

P2-12 Teacher Management:
- Add profile JSON field (subjects, joinedAt, qualifications) to User entity
- Add GET/PUT /rbac/users/:id/profile endpoints with UpdateProfileDto
- Add GET /rbac/teacher-workspace endpoint returning assignedClasses,
  todaySchedules, and myStudents
- Create /teacher-workspace page with tabs (My Classes, Today's Schedule,
  My Students)
- Add route with PermissionRoute and menu item in MainLayout

P2-13 Student Archive Multi-class:
- Add GET /students/:id/compare-classes endpoint returning side-by-side
  enrollment data with per-class attendance statistics
- Students module now includes ClassStudent and AttendanceRecord entities
- No 2-enrollment cap existed in the codebase; student enrollments
  already return all records via class-student table

apps/admin/src/App.tsx

@@ -24,6 +24,7 @@ import SchedulesPage from './pages/Schedules';
 import RolesPage from './pages/Roles';
 import PermissionsPage from './pages/Permissions';
 import AttendancePage from './pages/Attendance';
+import TeacherWorkspacePage from './pages/TeacherWorkspace';
 import PermissionRoute from './components/PermissionRoute';
 
 const PrivateRoute: React.FC<{ children: React.ReactNode }> = ({ children }) => {
@@ -220,6 +221,15 @@ const App: React.FC = () => {
                   </PermissionRoute>
                 }
               />
+
+              <Route
+                path="teacher-workspace"
+                element={
+                  <PermissionRoute permission="class:view">
+                    <TeacherWorkspacePage />
+                  </PermissionRoute>
+                }
+              />
             </Route>
           </Routes>
         </BrowserRouter>

apps/admin/src/layouts/MainLayout.tsx

@@ -23,6 +23,7 @@ import {
   SafetyOutlined,
   KeyOutlined,
   CheckCircleOutlined,
+  LaptopOutlined,
 } from '@ant-design/icons';
 import { usePermission } from '../hooks/usePermission';
 
@@ -51,6 +52,7 @@ const allMenuItems: MenuItemType[] = [
   { key: '/deposits', icon: <WalletOutlined />, label: '押金管理', permission: 'deposit:view' },
   { key: '/bills', icon: <FileTextOutlined />, label: '账单管理', permission: 'bill:view' },
   { key: '/classes', icon: <TeamOutlined />, label: '班级管理', permission: 'class:view' },
+  { key: '/teacher-workspace', icon: <LaptopOutlined />, label: '教师工作台', permission: 'class:view' },
   {
     key: 'classroom-group',
     icon: <ReadOutlined />,

apps/admin/src/pages/TeacherWorkspace/index.tsx

@@ -0,0 +1,187 @@
+import React, { useEffect, useState } from 'react';
+import { Card, Tabs, Table, Tag, Empty, Spin } from 'antd';
+import type { ColumnsType } from 'antd/es/table';
+import api from '../../api';
+
+interface AssignedClass {
+  classId: number;
+  className: string;
+  classCode: string;
+  roleType: string;
+  subject: string;
+}
+
+interface ScheduleItem {
+  id: number;
+  classId: number;
+  weekDay: number;
+  startTime: string;
+  endTime: string;
+  subject: string;
+  scheduleType: string;
+}
+
+interface StudentItem {
+  studentId: number;
+  studentName: string;
+  studentNo: string;
+  className: string;
+  classId: number;
+  joinDate: string;
+}
+
+interface WorkspaceData {
+  assignedClasses: AssignedClass[];
+  todaySchedules: ScheduleItem[];
+  myStudents: StudentItem[];
+}
+
+const ROLE_LABELS: Record<string, string> = {
+  head_teacher: '班主任',
+  life_teacher: '生活老师',
+  academic_teacher: '教务老师',
+  subject_teacher: '任课教师',
+};
+
+const WEEKDAY_LABELS: Record<string, string> = {
+  '1': '周一',
+  '2': '周二',
+  '3': '周三',
+  '4': '周四',
+  '5': '周五',
+  '6': '周六',
+  '7': '周日',
+};
+
+const TeacherWorkspacePage: React.FC = () => {
+  const [data, setData] = useState<WorkspaceData | null>(null);
+  const [loading, setLoading] = useState(false);
+
+  useEffect(() => {
+    const fetchData = async () => {
+      setLoading(true);
+      try {
+        const res = (await api.get('/rbac/teacher-workspace')) as WorkspaceData;
+        setData(res);
+      } catch (e) {
+        console.error(e);
+      } finally {
+        setLoading(false);
+      }
+    };
+    fetchData();
+  }, []);
+
+  const classColumns: ColumnsType<AssignedClass> = [
+    {
+      title: '班级名称',
+      dataIndex: 'className',
+      render: (v: string, r: AssignedClass) => `${v} (${r.classCode})`,
+    },
+    {
+      title: '角色',
+      dataIndex: 'roleType',
+      render: (v: string) => <Tag>{ROLE_LABELS[v] || v}</Tag>,
+    },
+    {
+      title: '科目',
+      dataIndex: 'subject',
+      render: (v: string | null) => v || '-',
+    },
+  ];
+
+  const scheduleColumns: ColumnsType<ScheduleItem> = [
+    {
+      title: '时间',
+      key: 'time',
+      render: (_: unknown, r: ScheduleItem) => `${r.startTime} - ${r.endTime}`,
+    },
+    {
+      title: '星期',
+      dataIndex: 'weekDay',
+      render: (v: number) => <Tag>{WEEKDAY_LABELS[String(v)] || v}</Tag>,
+    },
+    {
+      title: '科目',
+      dataIndex: 'subject',
+    },
+    {
+      title: '类型',
+      dataIndex: 'scheduleType',
+      render: (v: string) => (
+        <Tag color={v === 'INTERNAL' ? 'blue' : 'orange'}>
+          {v === 'INTERNAL' ? '内部课程' : '租赁'}
+        </Tag>
+      ),
+    },
+  ];
+
+  const studentColumns: ColumnsType<StudentItem> = [
+    { title: '姓名', dataIndex: 'studentName' },
+    { title: '学号', dataIndex: 'studentNo', render: (v: string) => v || '-' },
+    { title: '班级', dataIndex: 'className' },
+    { title: '加入日期', dataIndex: 'joinDate', render: (v: string) => v || '-' },
+  ];
+
+  if (loading) {
+    return (
+      <div style={{ textAlign: 'center', padding: 80 }}>
+        <Spin size="large" />
+      </div>
+    );
+  }
+
+  return (
+    <Card title="教师工作台">
+      <Tabs
+        defaultActiveKey="classes"
+        items={[
+          {
+            key: 'classes',
+            label: `我的班级 (${data?.assignedClasses.length || 0})`,
+            children: data?.assignedClasses.length ? (
+              <Table<AssignedClass>
+                columns={classColumns}
+                dataSource={data.assignedClasses}
+                rowKey="classId"
+                pagination={{ pageSize: 20, showTotal: (total) => `共 ${total} 个班级` }}
+              />
+            ) : (
+              <Empty description="暂无分配的班级" />
+            ),
+          },
+          {
+            key: 'schedule',
+            label: `今日课程 (${data?.todaySchedules.length || 0})`,
+            children: data?.todaySchedules.length ? (
+              <Table<ScheduleItem>
+                columns={scheduleColumns}
+                dataSource={data.todaySchedules}
+                rowKey="id"
+                pagination={{ pageSize: 20, showTotal: (total) => `共 ${total} 节` }}
+              />
+            ) : (
+              <Empty description="今日无排课" />
+            ),
+          },
+          {
+            key: 'students',
+            label: `我的学生 (${data?.myStudents.length || 0})`,
+            children: data?.myStudents.length ? (
+              <Table<StudentItem>
+                columns={studentColumns}
+                dataSource={data.myStudents}
+                rowKey="studentId"
+                pagination={{ pageSize: 20, showTotal: (total) => `共 ${total} 人` }}
+              />
+            ) : (
+              <Empty description="暂无学生" />
+            ),
+          },
+        ]}
+      />
+    </Card>
+  );
+};
+
+export default TeacherWorkspacePage;