Made admin pages dependency injectable

src/HopFrame.Web.Admin/Attributes/AdminPageUrlAttribute.cs

@@ -0,0 +1,10 @@
+namespace HopFrame.Web.Admin.Attributes;
+
+/// <summary>
+/// This attribute specifies the url of the admin page and needs to be applied on the AdminPage property in the AdminContext directly
+/// </summary>
+/// <param name="url">The page url: '/administration/{url}'</param>
+[AttributeUsage(AttributeTargets.Property)]
+public sealed class AdminPageUrlAttribute(string url) : Attribute {
+    public string Url { get; set; } = url;
+}