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/TableSpec.cs

@@ -0,0 +1,44 @@
+using System.Collections.Generic;
+
+namespace WorkerService.Models
+{
+    /// <summary>
+    /// Database table specification
+    /// </summary>
+    public class TableSpec
+    {
+        /// <summary>
+        /// Table name
+        /// </summary>
+        public string Name { get; set; }
+
+        /// <summary>
+        /// Data staging table name
+        /// </summary>
+        public string StagingTableName => $"#Staging{Name}";
+
+        /// <summary>
+        /// Temporary table name
+        /// </summary>
+        public string TempTableName => $"#{Name}";
+
+        /// <summary>
+        /// Table columns
+        /// </summary>
+        public List<ColumnSpec> Columns { get; set; }
+
+        /// <summary>
+        /// Table columns that form the primary key
+        /// </summary>
+        public List<ColumnSpec> PrimaryKey { get; set; }
+
+        /// <summary>
+        /// Constructor
+        /// </summary>
+        public TableSpec()
+        {
+            Columns = new List<ColumnSpec>();
+            PrimaryKey = new List<ColumnSpec>();
+        }
+    }
+}