Initial commit: React + Django 城市手册项目

- Django 4.2 + DRF + JWT + GraphQL
- React 18 + MobX + styled-components
- PostgreSQL 数据库
- Docker + Docker Compose + Nginx
- 完整的功能模块（用户、版块、文章、服务、交互、版主管理）
- 完整的文档（需求、部署、测试）

backend/apps/users/models.py

@@ -0,0 +1,45 @@
+from django.contrib.auth.models import AbstractUser
+from django.db import models
+
+
+class User(AbstractUser):
+    """Custom user model extending AbstractUser."""
+
+    ROLE_CHOICES = [
+        ('user', '普通用户'),
+        ('moderator', '版主'),
+        ('ai_auditor', 'AI审核员'),
+        ('admin', '管理员'),
+    ]
+
+    STATUS_CHOICES = [
+        ('active', '正常'),
+        ('disabled', '禁用'),
+    ]
+
+    email = models.EmailField(unique=True)
+    first_name = models.CharField(max_length=150)
+    last_name = models.CharField(max_length=150)
+    avatar = models.ImageField(upload_to='avatars/', null=True, blank=True)
+    role = models.CharField(max_length=20, choices=ROLE_CHOICES, default='user')
+    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='active')
+
+    USERNAME_FIELD = 'email'
+    REQUIRED_FIELDS = ['username', 'first_name']
+
+    class Meta:
+        db_table = 'users'
+        verbose_name = 'User'
+        verbose_name_plural = 'Users'
+
+    def __str__(self):
+        return self.email
+
+    def is_moderator(self):
+        return self.role == 'moderator'
+
+    def is_admin(self):
+        return self.role == 'admin'
+
+    def is_ai_auditor(self):
+        return self.role == 'ai_auditor'