初始化游戏小组管理系统后端项目

- 基于 NestJS + TypeScript + MySQL + Redis 架构
- 完整的模块化设计（认证、用户、小组、游戏、预约等）
- JWT 认证和 RBAC 权限控制系统
- Docker 容器化部署支持
- 添加 CLAUDE.md 项目开发指南
- 配置 .gitignore 忽略文件

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/entities/group.entity.ts

@@ -0,0 +1,69 @@
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  CreateDateColumn,
+  UpdateDateColumn,
+  ManyToOne,
+  JoinColumn,
+  OneToMany,
+} from 'typeorm';
+import { User } from './user.entity';
+import { GroupMember } from './group-member.entity';
+import { Appointment } from './appointment.entity';
+
+@Entity('groups')
+export class Group {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({ length: 100 })
+  name: string;
+
+  @Column({ type: 'text', nullable: true })
+  description: string;
+
+  @Column({ type: 'varchar', nullable: true, length: 255 })
+  avatar: string;
+
+  @Column()
+  ownerId: string;
+
+  @ManyToOne(() => User)
+  @JoinColumn({ name: 'ownerId' })
+  owner: User;
+
+  @Column({ default: 'normal', length: 20, comment: '类型: normal/guild' })
+  type: string;
+
+  @Column({ nullable: true, comment: '父组ID，用于子组' })
+  parentId: string;
+
+  @ManyToOne(() => Group, { nullable: true })
+  @JoinColumn({ name: 'parentId' })
+  parent: Group;
+
+  @Column({ type: 'text', nullable: true, comment: '公示信息' })
+  announcement: string;
+
+  @Column({ default: 50, comment: '最大成员数' })
+  maxMembers: number;
+
+  @Column({ default: 1, comment: '当前成员数' })
+  currentMembers: number;
+
+  @Column({ default: true })
+  isActive: boolean;
+
+  @CreateDateColumn()
+  createdAt: Date;
+
+  @UpdateDateColumn()
+  updatedAt: Date;
+
+  @OneToMany(() => GroupMember, (member) => member.group)
+  members: GroupMember[];
+
+  @OneToMany(() => Appointment, (appointment) => appointment.group)
+  appointments: Appointment[];
+}