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/SaxoniteStandardDbas/Dbas/Bus/SaxItemAddress_Dbas.cs

@@ -0,0 +1,33 @@
+using Sarand.Net.Standard.Base.Bus;
+using Sarand.Net.Standard.Base.Dbas;
+using Saxonite.Net.Standard.Base.App;
+using Saxonite.Net.Standard.Base.Bus;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Saxonite.Net.Standard.Dbas.Bus
+{
+	//=======================================================================
+	public class SaxItemAddress_Dbas : SaxItemAddress
+	{
+		//-------------------------------------------------------------------
+		// Data members.
+		private ISacsDatabase database;
+
+		//-------------------------------------------------------------------
+		// Construction.
+		public SaxItemAddress_Dbas(ISacsDatabase database, SysId id, ItemId itemId, Sax.AddressType addressType, UInt16 flags) :
+			base(id, itemId, addressType)
+		{
+			this.database = database;
+			Flags = flags;
+		}
+
+		//-------------------------------------------------------------------
+		// Associated data.
+
+		//-------------------------------------------------------------------
+	}
+	//=======================================================================
+}