feat: integrate CampusScope.filter() into all business services (12 services + 12 modules)

apps/server/src/bills/bills.module.ts

@@ -1,5 +1,6 @@
 import { Module } from '@nestjs/common';
 import { NotificationsModule } from '../notifications/notifications.module';
+import { DepartmentsModule } from '../departments/departments.module';
 import { TypeOrmModule } from '@nestjs/typeorm';
 import { Bill } from '../entities/bill.entity';
 import { BillItem } from '../entities/bill-item.entity';
@@ -26,6 +27,7 @@ import { BillsController } from './bills.controller';
       Student,
     ]),
     NotificationsModule,
+    DepartmentsModule,
   ],
   controllers: [BillsController],
   providers: [BillsService, BillsExportService],