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/Web/Base/Controllers/SaxController_Encryption_Tester.cs

@@ -0,0 +1,40 @@
+using NUnit.Framework;
+using Sarand.Net.Standard.Base.Helpers;
+using Sacs.Web.Components;
+using System;
+using System.Collections.Specialized;
+
+namespace Saxonite.Net.Core.UnitTests.Web.Base.Controllers
+{
+	//=======================================================================
+	[TestFixture]
+	public class SaxController_Encryption_Tester
+	{
+		//-------------------------------------------------------------------
+		[Test]
+		public void Test_ParameterEncryption_RoundTripAndPurposeIsolation()
+		{
+			String key = SacsEncryptionHelper.EncodePlainKey("Saxonite unit test encryption key", SacsEncryptionHelper.KeyLength);
+			NameValueCollection parameters = new NameValueCollection
+			{
+				{ "item", "12345" },
+				{ "caption", "Saxonite café" },
+			};
+			String encrypted = SaController.EncryptParameters(parameters, key, "Saxonite.UnitTests.Parameters");
+
+			NameValueCollection decrypted = SaController.DecryptParameters(encrypted, key, "Saxonite.UnitTests.Parameters");
+			Assert.That(decrypted["item"], Is.EqualTo("12345"));
+			Assert.That(decrypted["caption"], Is.EqualTo("Saxonite café"));
+
+			NameValueCollection wrongPurpose = SaController.DecryptParameters(encrypted, key, "Saxonite.UnitTests.OtherPurpose");
+			Assert.That(wrongPurpose.Count, Is.EqualTo(0));
+
+			String tampered = (encrypted[0] == 'A' ? "B" : "A") + encrypted.Substring(1);
+			NameValueCollection modified = SaController.DecryptParameters(tampered, key, "Saxonite.UnitTests.Parameters");
+			Assert.That(modified.Count, Is.EqualTo(0));
+		}
+
+		//-------------------------------------------------------------------
+	}
+	//=======================================================================
+}