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-member.entity.ts

@@ -0,0 +1,49 @@
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  CreateDateColumn,
+  ManyToOne,
+  JoinColumn,
+  Unique,
+} from 'typeorm';
+import { GroupMemberRole } from '../common/enums';
+import { User } from './user.entity';
+import { Group } from './group.entity';
+
+@Entity('group_members')
+@Unique(['groupId', 'userId'])
+export class GroupMember {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column()
+  groupId: string;
+
+  @ManyToOne(() => Group, (group) => group.members, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'groupId' })
+  group: Group;
+
+  @Column()
+  userId: string;
+
+  @ManyToOne(() => User, (user) => user.groupMembers, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'userId' })
+  user: User;
+
+  @Column({
+    type: 'enum',
+    enum: GroupMemberRole,
+    default: GroupMemberRole.MEMBER,
+  })
+  role: GroupMemberRole;
+
+  @Column({ type: 'varchar', nullable: true, length: 50, comment: '组内昵称' })
+  nickname: string;
+
+  @Column({ default: true })
+  isActive: boolean;
+
+  @CreateDateColumn()
+  joinedAt: Date;
+}