Fix build and code structure improvements. New but essential UI functionality. CI improvements. Documentation improvements. AI module improvements.

src/Signer/StellaOps.Signer/StellaOps.Signer.WebService/Program.cs

@@ -56,4 +56,5 @@ app.TryRefreshStellaRouterEndpoints(routerOptions);
 
 app.Run();
 
+// Expose Program class for WebApplicationFactory in tests
 public partial class Program;