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/DataUpdateTask.cs

@@ -0,0 +1,26 @@
+using System;
+using DataModel.Models;
+
+namespace WorkerService.Models
+{
+    /// <summary>
+    /// Cached data update task
+    /// </summary>
+    public class DataUpdateTask
+    {
+        /// <summary>
+        /// Data update configuration
+        /// </summary>
+        public DataSourceConfig Configuration { get; set; }
+
+        /// <summary>
+        /// Type of update needed
+        /// </summary>
+        public UpdateTypes UpdateType { get; set; }
+
+        /// <summary>
+        /// Minimum timestamp to import changeset from
+        /// </summary>
+        public DateTime? MinimumDT { get; set; }
+    }
+}