feat: ✨ 前端：玩家服务平台和运营管理系统后台初始化及框架搭建，后端：完成基础功能搭建。

backend/src/entities/admin-user.entity.ts

@@ -0,0 +1,34 @@
+import { Entity, PrimaryGeneratedColumn, Column, CreateDateColumn, UpdateDateColumn, Index } from 'typeorm';
+
+export enum AdminRole {
+  SUPER_ADMIN = 'super_admin',
+  OPERATOR = 'operator',
+  VIEWER = 'viewer',
+}
+
+@Entity('admin_users')
+export class AdminUser {
+  @PrimaryGeneratedColumn({ type: 'bigint', comment: '用户ID' })
+  id: number;
+
+  @Column({ type: 'varchar', length: 50, unique: true, comment: '用户名' })
+  @Index()
+  username: string;
+
+  @Column({ type: 'char', length: 60, comment: '密码哈希(bcrypt)' })
+  passwordHash: string;
+
+  @Column({
+    type: 'enum',
+    enum: AdminRole,
+    default: AdminRole.VIEWER,
+    comment: '角色：super_admin-超级管理员, operator-操作员, viewer-查看者',
+  })
+  role: AdminRole;
+
+  @CreateDateColumn({ type: 'datetime', comment: '创建时间' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ type: 'datetime', comment: '更新时间' })
+  updatedAt: Date;
+}