Initial commit: JDE Scoping Tool migration project

Set up repository with legacy .NET Framework 4.8 source (OLD/),
new .NET 10 Blazor solution (NEW/), OpenSpec specifications,
documentation, and project configuration.

OLD/WebInterface/Controllers/InvalidUAController.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web;
+using System.Web.Mvc;
+
+namespace WebInterface.Controllers
+{
+    /// <summary>
+    /// Invalid user agent notification controller
+    /// </summary>
+    public class InvalidUAController : Controller
+    {
+        // GET: InvalidUA
+        [AllowAnonymous]
+        public ActionResult InvalidUserAgent()
+        {
+            return View();
+        }
+    }
+}