feat: 美化文章界面 (#3)

Reviewed-on: #3

YaeBlog.Core/Models/BlogHeadline.cs

@@ -0,0 +1,10 @@
+namespace YaeBlog.Core.Models;
+
+public class BlogHeadline(string title, string selectorId)
+{
+    public string Title { get; } = title;
+
+    public string SelectorId { get; set; } = selectorId;
+
+    public List<BlogHeadline> Children { get; } = [];
+}