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/SaxoniteCoreWebOnline/appsettings.Production.json

@@ -0,0 +1,19 @@
+{
+	"EmailConfigs": {
+		"SAX-SF-Prod": {
+			"Message": {
+				"AddressFrom": "DoNotReply@sportierre.com"
+			},
+			"SMTP": {
+				"Server": "smtp.ionos.co.uk",
+				"ServerPort": 587,
+				"UseSSL": true
+			},
+			"Send": {
+				"Using": 2,
+				"UserName": "info@sportierre.com",
+				"Password": "5p0rTi3rre-info-2021!"
+			}
+		}
+	}
+}