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/DataModel/Models/RouteMaster.cs

@@ -0,0 +1,76 @@
+using System;
+using DataModel.Helpers;
+
+namespace DataModel.Models
+{
+    /// <summary>
+    /// JDE item router master model
+    /// </summary>
+    public class RouteMaster
+    {
+        /// <summary>
+        /// Unique code for branch
+        /// </summary>
+        public string BranchCode { get; set; }
+
+        /// <summary>
+        /// Unique number for item
+        /// </summary>
+        public string ItemNumber { get; set; }
+
+        /// <summary>
+        /// Router type
+        /// </summary>
+        public string RoutingType { get; set; }
+
+        /// <summary>
+        /// Job step operation number
+        /// </summary>
+        public decimal SequenceNumber { get;set; }
+
+        /// <summary>
+        /// Job step function code
+        /// </summary>
+        public string FunctionCode { get; set; }
+
+        /// <summary>
+        /// Work center unique code
+        /// </summary>
+        public string WorkCenterCode { get; set; }
+
+        /// <summary>
+        /// Numeric representation of date record effectivity starts
+        /// </summary>
+        public int StartDate_Date { get; set; }
+
+        /// <summary>
+        /// Date record effectivity starts
+        /// </summary>
+        public DateTime StartDate => StartDate_Date.FromJDEDate();
+
+        /// <summary>
+        /// Numeric representation of date record effectivity ends
+        /// </summary>
+        public int? EndDate_Date { get; set; }
+
+        /// <summary>
+        /// Date record effectivity ends
+        /// </summary>
+        public DateTime? EndDate => EndDate_Date?.FromJDEDate();
+
+        /// <summary>
+        /// Date of last update to record
+        /// </summary>
+        private int LastUpdateDate { get; }
+
+        /// <summary>
+        /// Time of day of last update to record
+        /// </summary>
+        private int LastUpdateTime { get; }
+
+        /// <summary>
+        /// Timestamp of last update to record
+        /// </summary>
+        public DateTime LastUpdateDT => LastUpdateDate.FromJDEDate().FromJDEDateTime(LastUpdateTime);
+    }
+}