Revert "feat(blog): add Visibility { Private, Public } to gate post reads"

This reverts commit 33ecfa7ebd.

src/Yavsc.Abstract/Blogspot/BlogPost.cs

@@ -19,18 +19,6 @@ public class BlogPostDto : IBlogPost
     public string UserModified { get; set; }
     public string Title { get; set; }
 
-    /// <summary>
-    /// Visibility of this post. Mirrors the EF entity
-    /// <c>Yavsc.Models.Blog.BlogPost.Visibility</c>: serialised
-    /// as an <c>int</c> by <c>System.Text.Json</c> (the enum's
-    /// underlying type), so clients see <c>0</c> or <c>1</c>
-    /// rather than <c>"Private"</c>/<c>"Public"</c>. Defaults
-    /// to <see cref="Visibility.Private"/> on construction, so
-    /// existing client code that doesn't set it explicitly
-    /// stays safe (private-by-default).
-    /// </summary>
-    public Visibility Visibility { get; set; } = Visibility.Private;
-
     public bool AuthorizeCircle(long circleId)
     {
         throw new NotImplementedException();