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/wwwroot/css/sax-spt-sel.css

@@ -0,0 +1,61 @@
+/*
+    Sport Selection stylesheet.
+*/
+
+/* Panels */
+
+#dlgSelectSport .SelectedSportName
+{
+	min-height: 26px;
+	padding: 2px 4px;
+	background-color: #f0f0f0;
+	border: 1px solid #b0b0b0;
+	border-radius: 4px;
+	overflow: hidden;
+}
+
+#dlgSelectSport .SportFilter .sax-label
+{
+	margin-right: 6px;
+}
+
+#dlgSelectSport .sax-button
+{
+	padding: 2px 8px;
+	border-radius: 6px;
+}
+
+#dlgSelectSport .sax-selectSport-sports
+{
+	margin-bottom: 8px;
+	padding: 2px 0;
+	background-color: #f0f0f0;
+	border: 1px solid #b0b0b0;
+	border-top-left-radius: 6px;
+	border-bottom-left-radius: 6px;
+	overflow-x: hidden;
+	overflow-y: scroll;
+}
+
+#dlgSelectSport.sax-form button.sax-button
+{
+	margin: 4px 0;
+}
+
+#dlgSelectSport .sax-panel-item.Sport
+{
+	margin: 2px 4px;
+	padding: 2px 4px;
+	background-color: #fff;
+	border: 2px solid #d8d8ff;
+	border-radius: 4px;
+	cursor: pointer;
+}
+
+#dlgSelectSport .sax-panel-item.Sport.sel
+{
+	background-color: #ececff;
+	border-color: #8a8aff;
+}
+
+/* The End */