Refactor scope handling with new IScoped and AuthScope

Introduce IScoped<TScope> interface for unified scope access and add AuthScope record. Remove legacy IScopedRequest interfaces to streamline scope management across the application.

src/ReC.Application/Common/Interfaces/IAuthScoped.cs

@@ -0,0 +1,13 @@
+using System.Text.Json.Serialization;
+
+namespace ReC.Application.Common.Interfaces;
+
+public record AuthScope
+{
+    public string AddedWho { get; } = null!;
+}
+
+public interface IAuthScoped : IScoped<AuthScope>
+{
+    public string AddedWho => Scope.AddedWho;
+}