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/SaxoniteCoreWebAdmin/wwwroot/css/sax-selectCode.css

@@ -0,0 +1,36 @@
+/*
+    Admin - Code Selection stylesheet.
+*/
+
+/* Panels */
+
+.sax-selectCode-codes
+{
+	padding:2px 0;
+	background-color:#f0f0f0;
+	border: 1px solid #b0b0b0;
+	border-radius: 6px;
+}
+
+#dlgSelectCode.sax-form button.sax-button
+{
+	margin: 4px 0;
+}
+
+.sax-panel-item.Code
+{
+	margin: 2px 4px;
+	padding: 2px 4px;
+	background-color:#fff;
+	border: 2px solid #d8d8ff;
+	border-radius: 4px;
+	cursor:pointer;
+}
+
+.sax-panel-item.Code.sel
+{
+	background-color: #ececff;
+	border-color: #8a8aff;
+}
+
+/* The End */