refactor(server): 日期工具统一迁入 dayjs（utc 插件），移除手写 Intl/padStart 重复实现

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

@@ -1,4 +1,5 @@
 import { UseGuards } from '@nestjs/common';
+import dayjs from '../common/dayjs';
 import { AttendanceService } from './attendance.service';
 import { AttendanceImportService } from './attendance-import.service';
 import { OperationLogsService } from '../operation-logs/operation-logs.service';
@@ -32,11 +33,7 @@ export abstract class AttendanceControllerBase {
   ) {}
 
   protected getTodayDateOnly(): string {
-    const today = new Date();
-    const year = today.getFullYear();
-    const month = String(today.getMonth() + 1).padStart(2, '0');
-    const day = String(today.getDate()).padStart(2, '0');
-    return `${year}-${month}-${day}`;
+    return dayjs().format('YYYY-MM-DD');
   }
 
   protected canManageAllAttendance(req: { user: RequestUser }): boolean {