1、增加图片视频

2、优化代码结构
3、up主下载分类逻辑可配置

dto/DouyinVideoPageRequestDto.cs

@@ -0,0 +1,26 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace dy.net.dto
+{
+    public class DouyinVideoPageRequestDto : PageRequestDto
+    {
+        // 3. 引用类型（string）如果允许为null，显式声明为 string?
+        public string? Tag { get; set; }
+
+        public string? Author { get; set; }
+
+        public string? ViedoType { get; set; }
+
+        // 4. 泛型集合（List<string>）允许为null，声明为 List<string>?
+        public List<string>? Dates { get; set; }
+    }
+
+
+    public class PageRequestDto
+    {
+
+        public int PageIndex { get; set; }
+
+        public int PageSize { get; set; } = 10;
+    }
+}