feat: add Bed and Locker entities with Room FK

apps/server/src/entities/locker.entity.ts

@@ -0,0 +1,38 @@
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  CreateDateColumn,
+  UpdateDateColumn,
+  ManyToOne,
+  JoinColumn,
+} from 'typeorm';
+import { Room } from './room.entity';
+
+@Entity('lockers')
+export class Locker {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column({ name: 'room_id' })
+  roomId: number;
+
+  @ManyToOne(() => Room, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'room_id' })
+  room: Room;
+
+  @Column({ name: 'locker_number', length: 20 })
+  lockerNumber: string;
+
+  @Column({ type: 'varchar', length: 20, default: 'available' })
+  status: string;
+
+  @Column({ type: 'text', nullable: true })
+  notes: string;
+
+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ name: 'updated_at' })
+  updatedAt: Date;
+}