refactor(server): 清理无用导入与类型转换

- 移除测试/控制器中未使用的导入与实例
- bills/classroom-rentals 改用 ESM 导入替代 require
- bills.service 去掉多余断言、backfill 显式转字符串、main.ts void bootstrap

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

@@ -23,24 +23,10 @@ describe('AttendanceRecordsController — DingTalk import scope', () => {
     can: jest.fn().mockReturnValue(false),
   };
 
-  let controller: AttendanceController;
-  let recordsController: AttendanceRecordsController;
   let importController: AttendanceImportController;
 
   beforeEach(() => {
     jest.clearAllMocks();
-    controller = new AttendanceController(
-      attendanceService as unknown as AttendanceService,
-      importService as unknown as AttendanceImportService,
-      logService as unknown as OperationLogsService,
-      authzService as never,
-    );
-    recordsController = new AttendanceRecordsController(
-      attendanceService as unknown as AttendanceService,
-      importService as unknown as AttendanceImportService,
-      logService as unknown as OperationLogsService,
-      authzService as never,
-    );
     importController = new AttendanceImportController(
       attendanceService as unknown as AttendanceService,
       importService as unknown as AttendanceImportService,