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/POReceiver.cs

@@ -0,0 +1,75 @@
+using System;
+
+namespace DataModel.Models
+{
+    /// <summary>
+    /// JDE PO receiver record
+    /// </summary>
+    public class POReceiver
+    {
+        /// <summary>
+        /// PO number
+        /// </summary>
+        public long OrderNumber { get; set; }
+
+        /// <summary>
+        /// PO order company code
+        /// </summary>
+        public string OrderCompany { get; set; }
+
+        /// <summary>
+        /// PO suffix
+        /// </summary>
+        public string OrderSuffix { get; set; }
+
+        /// <summary>
+        /// Line number within PO
+        /// </summary>
+        public decimal LineNumber { get; set; }
+
+        /// <summary>
+        /// Total number of lines in PO
+        /// </summary>
+        public int NumberOfLines { get; set; }
+
+        /// <summary>
+        /// PO invoice number
+        /// </summary>
+        public long InvoiceNumber { get; set; }
+
+        /// <summary>
+        /// Receiving site identifier
+        /// </summary>
+        public string BranchCode { get; set; }
+
+        /// <summary>
+        /// Product lot number
+        /// </summary>
+        public string LotNumber { get; set; }
+
+        /// <summary>
+        /// Product unique item number
+        /// </summary>
+        public string ShortItemNumber { get; set; }
+
+        /// <summary>
+        /// Date product was received
+        /// </summary>
+        public DateTime DateReceived { get; set; }
+
+        /// <summary>
+        /// Subledger name
+        /// </summary>
+        public string Subledger { get; set; }
+
+        /// <summary>
+        /// Product quantity recieved
+        /// </summary>
+        public decimal QtyReceived { get; set; }
+
+        /// <summary>
+        /// Timestamp of last update to record
+        /// </summary>
+        public DateTime LastUpdateDT { get; set; }
+    }
+}