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/libman.json

@@ -0,0 +1,10 @@
+{
+	"version": "1.0",
+	"defaultProvider": "cdnjs",
+	"libraries": [
+		{
+			"library": "jqueryui@1.12.1",
+			"destination": "wwwroot/lib/jquery-ui/"
+		}
+	]
+}