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/SaxoniteStandardBase/Base/App/SaxApplication_Base.cs

@@ -0,0 +1,48 @@
+using Sarand.Net.Standard.Base.Dbas;
+using Saxonite.Net.Standard.Base.Consoles;
+using Saxonite.Net.Standard.Base.App;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Sarand.Net.Standard.Base.Core;
+
+namespace Saxonite.Net.Standard.Base.App
+{
+	//=======================================================================
+	public abstract class SaxApplication_Base : SacsDisposable
+	{
+		//-------------------------------------------------------------------
+		// Protected construction.
+		protected SaxApplication_Base()
+		{
+			App = this;
+		}
+		protected override void Dispose(bool disposing)
+		{
+			if (disposing)
+			{
+				App = null;
+			}
+		}
+
+		//-------------------------------------------------------------------
+		// Globals.
+		public static SaxApplication_Base App { get; private set; }
+		public abstract SaxSystem System { get; }
+		public abstract SaxConsoleHelper ConsoleHelper { get; }
+		// Database.
+		public abstract ISacsDatabase GetDatabase(SaxSessionContext sessionContext, Sax.Database databaseType);
+		public abstract IDatabaseInfo CreateDbInfo(SaxSessionContext sessionContext, Sax.Database databaseType);
+		// Application instance.
+		public abstract Sax.InstanceType InstanceType { get; }
+		public bool IsLiveHost() { return InstanceType == Sax.InstanceType.Prod; }
+		public bool IsTestHost() { return InstanceType != Sax.InstanceType.Prod; }
+		public bool IsDevHost() { return InstanceType == Sax.InstanceType.Dev; }
+		public abstract String EnvironmentName { get; }
+		// Email configuration.
+		public abstract SaxEmailConfig EmailConfig { get; }
+
+		//-------------------------------------------------------------------
+	}
+	//=======================================================================
+}