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/regions/models.py

@@ -0,0 +1,54 @@
+from django.db import models
+
+
+class Region(models.Model):
+    """Region model for hierarchical administrative divisions."""
+
+    LEVEL_CHOICES = [
+        ('province', '省'),
+        ('city', '市'),
+        ('county', '县'),
+        ('town', '乡镇/街道'),
+        ('village', '村/居委会'),
+    ]
+
+    STATUS_CHOICES = [
+        ('active', '正常'),
+        ('inactive', '停用'),
+    ]
+
+    name = models.CharField(max_length=100, verbose_name='版块名称')
+    level = models.CharField(max_length=20, choices=LEVEL_CHOICES, verbose_name='版块级别')
+    parent = models.ForeignKey(
+        'self',
+        on_delete=models.CASCADE,
+        null=True,
+        blank=True,
+        related_name='children',
+        verbose_name='上级版块'
+    )
+    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='active', verbose_name='状态')
+    created_at = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')
+    updated_at = models.DateTimeField(auto_now=True, verbose_name='更新时间')
+
+    class Meta:
+        db_table = 'regions'
+        verbose_name = '版块'
+        verbose_name_plural = '版块'
+        ordering = ['level', 'name']
+
+    def __str__(self):
+        return self.name
+
+    def get_full_path(self):
+        """Get the full hierarchical path of this region."""
+        path = [self.name]
+        parent = self.parent
+        while parent:
+            path.insert(0, parent.name)
+            parent = parent.parent
+        return ' → '.join(path)
+
+    def get_children(self):
+        """Get all direct children of this region."""
+        return self.children.filter(status='active')