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/WorkerService/Templates/QueryTemplateExtension.cs

@@ -0,0 +1,24 @@
+using WorkerService.Models.Reporting;
+
+namespace WorkerService.Templates
+{
+    /// <summary>
+    /// Query template extensions
+    /// </summary>
+    public partial class QueryTemplate
+    {
+        /// <summary>
+        /// Template data model
+        /// </summary>
+        public SearchModel Model { get; }
+
+        /// <summary>
+        /// Constructor
+        /// </summary>
+        /// <param name="model">Template data model</param>
+        public QueryTemplate(SearchModel? model = null)
+        {
+            Model = model ?? new SearchModel();
+        }
+    }
+}