v1.3.0 Restructure Saxonite workspace and upgrade to .NET 10 (#1)

Move Saxonite’s projects into a dedicated `Workspace` folder and align the solution with .NET 10 and the current Common workspace. Update encryption integration, test project structure and coverage, and repository guidance and upgrade notes.

- Relocate application and library projects while retaining Git rename history.
- Split tests into Admin, Online, and Shared projects; add representative behavioral and serialization tests.
- Update Common integration, application version, and repository documentation.

Application version: 1.3.0

Reviewed-on: #1
Co-authored-by: andy <andy@sarand.com>

Workspace/SaxoniteCoreWebAdmin/Admin/App/Program.cs

@@ -0,0 +1,41 @@
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Saxonite.Net.Core.Web.Admin.App
+{
+	//=======================================================================
+	public class Program
+	{
+		//-------------------------------------------------------------------
+		public static void Main(string[] args)
+		{
+			try
+			{
+				CreateHostBuilder(args).Build().Run();
+			}
+			finally
+			{
+				// Cleanup - globals, async processes etc.
+				if (SaxApplication_Admin.AppInstance != null)
+					SaxApplication_Admin.AppInstance.Dispose();
+			}
+		}
+
+		//-------------------------------------------------------------------
+		public static IHostBuilder CreateHostBuilder(string[] args) =>
+			Host.CreateDefaultBuilder(args)
+				.ConfigureWebHostDefaults(webBuilder =>
+				{
+					webBuilder.UseStartup<SaxStartup_Admin>();
+				});
+
+		//-------------------------------------------------------------------
+	}
+	//=======================================================================
+}