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.

NEW/tests/JdeScoping.Database.Tests/Placeholder.cs

@@ -0,0 +1,8 @@
+// This file exists to ensure the test project compiles.
+// Add tests here as needed.
+namespace JdeScoping.Database.Tests;
+
+public class Placeholder
+{
+    // Tests will be added here
+}