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/Models/Reporting/OutputTableAttribute.cs

@@ -0,0 +1,25 @@
+using System;
+
+namespace WorkerService.Models.Reporting
+{
+    /// <summary>
+    /// Excel output table specification
+    /// </summary>
+    public class OutputTableAttribute : Attribute
+    {
+        /// <summary>
+        /// Output tab name
+        /// </summary>
+        public string TabName { get; set; }
+
+        /// <summary>
+        /// Table name
+        /// </summary>
+        public string TableName { get; set; }
+
+        /// <summary>
+        /// Whether or not merged header should be shown
+        /// </summary>
+        public bool ShowHeader { get; set; }
+    }
+}