fix: add missing Bed and Locker entities to TypeORM registration

apps/server/src/entities/index.ts

@@ -1,6 +1,8 @@
 export { Student } from './student.entity';
 export { Room } from './room.entity';
 export { Occupancy } from './occupancy.entity';
+export { Bed } from './bed.entity';
+export { Locker } from './locker.entity';
 export { RoomExpense } from './room-expense.entity';
 export { PersonalExpense } from './personal-expense.entity';
 export { Bill } from './bill.entity';