feat: add student wallet utility billing

apps/server/src/expenses/expenses.module.ts

@@ -7,11 +7,13 @@ import { Student } from '../entities/student.entity';
 import { ExpensesService } from './expenses.service';
 import { ExpensesController } from './expenses.controller';
 import { OperationLogsModule } from '../operation-logs/operation-logs.module';
+import { BillsModule } from '../bills/bills.module';
 
 @Module({
   imports: [
     TypeOrmModule.forFeature([RoomExpense, PersonalExpense, Room, Student]),
     OperationLogsModule,
+    BillsModule,
   ],
   controllers: [ExpensesController],
   providers: [ExpensesService],