feat: add class roster export and attendance stats export

- GET /classes/:id/roster/export — Excel export with 姓名/学号/加入日期/状态
- GET /attendance-records/export — Excel export with 姓名/班级/日期/时段/状态/来源/备注/打卡时间
- Add findAllForExport to AttendanceService (no pagination)
- Both use ExcelJS following classrooms controller downloadTemplate pattern

apps/server/src/attendance/attendance.controller.ts

@@ -7,7 +7,9 @@ import {
   Query,
   UseGuards,
   Request,
+  Res,
 } from '@nestjs/common';
+import type { Response } from 'express';
 import { AttendanceService } from './attendance.service';
 import {
   BatchCreateAttendanceDto,
@@ -21,6 +23,7 @@ import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
 import { OperationLogsService } from '../operation-logs/operation-logs.service';
 import { extractRequestInfo } from '../common/request-utils';
 import { RequirePermission } from '../auth/decorators/permission.decorator';
+import * as ExcelJS from 'exceljs';
 
 @UseGuards(JwtAuthGuard)
 @Controller()
@@ -51,6 +54,61 @@ export class AttendanceController {
     return result;
   }
 
+  // ── Export attendance records ──
+  @Get('attendance-records/export')
+  @RequirePermission('attendance:view')
+  async exportRecords(
+    @Query() query: QueryAttendanceRecordsDto,
+    @Res() res: Response,
+  ) {
+    const records = await this.service.findAllForExport(query);
+
+    const workbook = new ExcelJS.Workbook();
+    const ws = workbook.addWorksheet('考勤统计报表');
+    ws.columns = [
+      { header: '姓名', key: 'studentName', width: 15 },
+      { header: '班级', key: 'className', width: 20 },
+      { header: '日期', key: 'attendanceDate', width: 15 },
+      { header: '时段', key: 'session', width: 15 },
+      { header: '状态', key: 'status', width: 10 },
+      { header: '来源', key: 'source', width: 10 },
+      { header: '备注', key: 'remark', width: 30 },
+      { header: '打卡时间', key: 'createdAt', width: 20 },
+    ];
+    ws.getRow(1).font = { bold: true };
+    ws.getRow(1).fill = { type: 'pattern', pattern: 'solid', fgColor: { argb: 'FFE0E0E0' } };
+
+    for (const record of records) {
+      ws.addRow({
+        studentName: record.student?.name || '',
+        className: record.class?.name || '',
+        attendanceDate: record.attendanceDate || '',
+        session: record.session || '',
+        status: record.status || '',
+        source: record.source || '',
+        remark: record.remark || '',
+        createdAt: record.createdAt
+          ? record.createdAt.toISOString().replace('T', ' ').substring(0, 19)
+          : '',
+      });
+    }
+
+    const dateRange = [query.dateFrom, query.dateTo]
+      .filter(Boolean)
+      .join('-') || '全部';
+
+    res.setHeader(
+      'Content-Type',
+      'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+    );
+    res.setHeader(
+      'Content-Disposition',
+      `attachment; filename=${encodeURIComponent(`考勤统计报表-${dateRange}`)}.xlsx`,
+    );
+    await workbook.xlsx.write(res);
+    res.end();
+  }
+
   // ── List attendance records with filters ──
   @Get('attendance-records')
   @RequirePermission('attendance:view')