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/IScoped.cs

@@ -0,0 +1,10 @@
+using MediatR;
+using System.Text.Json.Serialization;
+
+namespace ReC.Application.Common.Interfaces;
+
+public interface IScoped<TScope> where TScope : notnull
+{
+    [JsonIgnore]
+    public TScope Scope { get; }
+}