feat(task1): restructure directories for turborepo monorepo

- Move backend/ to apps/server/ via git mv
- Move frontend/ to apps/admin/ via git mv
- Create packages/typescript-config/ with base, nestjs, and react-vite presets

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

@@ -0,0 +1,43 @@
+import { Entity, PrimaryGeneratedColumn, Column, CreateDateColumn, UpdateDateColumn, ManyToMany, JoinTable } from 'typeorm';
+import { Role } from './role.entity';
+
+@Entity('users')
+export class User {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column({ length: 50, unique: true })
+  username: string;
+
+  @Column({ name: 'password_hash', length: 255 })
+  passwordHash: string;
+
+  // 移除: @Column({ type: 'varchar', length: 20, default: 'operator' })
+  // role: string;
+
+  @Column({ length: 50, nullable: true })
+  name: string;
+
+  // 移除: @Column({ name: 'allowed_menus', type: 'text', nullable: true })
+  // allowedMenus: string;
+
+  @Column({ name: 'is_active', default: true })
+  isActive: boolean;
+
+  @Column({ name: 'last_login_at', type: 'datetime', nullable: true })
+  lastLoginAt: Date;
+
+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ name: 'updated_at' })
+  updatedAt: Date;
+
+  @ManyToMany(() => Role, (role) => role.users)
+  @JoinTable({
+    name: 'user_roles',
+    joinColumn: { name: 'user_id', referencedColumnName: 'id' },
+    inverseJoinColumn: { name: 'role_id', referencedColumnName: 'id' },
+  })
+  roles: Role[];
+}