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/SaxoniteUnitTestsShared/UnitTests/Data/Bus/SaxRegion_Bus_Tester.cs

@@ -0,0 +1,36 @@
+using NUnit.Framework;
+using Saxonite.Net.Standard.Base.App;
+using Saxonite.Net.Standard.Base.Bus;
+using System.Collections.Generic;
+
+namespace Saxonite.Net.Core.UnitTests.Data.Bus
+{
+	//=======================================================================
+	[TestFixture]
+	public class SaxRegion_Bus_Tester
+	{
+		//-------------------------------------------------------------------
+		[TestCase(Sax.RegionType.World, Sax.RegionType.Galaxy, true)]
+		[TestCase(Sax.RegionType.Continent, Sax.RegionType.World, true)]
+		[TestCase(Sax.RegionType.Country, Sax.RegionType.SubContinent, true)]
+		[TestCase(Sax.RegionType.Province, Sax.RegionType.Nation, true)]
+		[TestCase(Sax.RegionType.Province, Sax.RegionType.State, false)]
+		[TestCase(Sax.RegionType.Unknown, Sax.RegionType.World, false)]
+		public void IsValidParentRegionType_ReflectsRegionHierarchy(Sax.RegionType regionType, Sax.RegionType parentType, bool expected)
+		{
+			Assert.That(SaxRegion.IsValidParentRegionType(regionType, parentType), Is.EqualTo(expected));
+		}
+
+		//-------------------------------------------------------------------
+		[Test]
+		public void GetValidParentRegionTypes_ReturnsAnIndependentList()
+		{
+			List<Sax.RegionType> parentTypes = SaxRegion.GetValidParentRegionTypes(Sax.RegionType.Country);
+			parentTypes.Clear();
+
+			Assert.That(SaxRegion.GetValidParentRegionTypes(Sax.RegionType.Country),
+				Is.EquivalentTo(new[] { Sax.RegionType.Continent, Sax.RegionType.SubContinent }));
+		}
+	}
+	//=======================================================================
+}