feat(公开内容): 添加公开内容功能，支持文档和软件下载，无需登录即可访问

core/models.py

@@ -216,3 +216,37 @@ class SystemConfig(models.Model):
         """获取系统配置，单例模式"""
         config, created = cls.objects.get_or_create(pk=1)
         return config
+
+class PublicContentType(models.Model):
+    """公开内容类型"""
+    name = models.CharField(max_length=20, unique=True, verbose_name="名称")
+    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:
+        verbose_name = "公开内容类型"
+        verbose_name_plural = "公开内容类型"
+        ordering = ['name']
+    
+    def __str__(self):
+        return self.name
+
+class PublicContent(models.Model):
+    """公开内容表"""
+    type = models.ForeignKey(PublicContentType, on_delete=models.CASCADE, verbose_name="类型")
+    title = models.CharField(max_length=200, verbose_name="标题")
+    content = models.TextField(blank=True, null=True, verbose_name="内容")
+    file = models.FileField(upload_to='public_files/', blank=True, null=True, verbose_name="上传文件")
+    url = models.URLField(blank=True, null=True, verbose_name="链接地址")
+    sort_order = models.IntegerField(default=0, verbose_name="排序")
+    is_published = models.BooleanField(default=True, verbose_name="是否发布")
+    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:
+        verbose_name = "公开内容"
+        verbose_name_plural = "公开内容"
+        ordering = ['sort_order', '-created_at']
+    
+    def __str__(self):
+        return f"{self.type.name} - {self.title}"