Enhance site layout rendering and integrate shared components

- Added read-only access to shared frontend components in `docker-compose.app.yml`.
- Updated TypeScript configuration in `tsconfig.app.json` and `tsconfig.json` to support path mapping for shared components.
- Modified CSS imports in `index.css` to accommodate shared styles.
- Refactored layout rendering logic in `layoutRenderer.tsx` to utilize shared layout components for various site layouts.
- Improved template rendering in `templateEngine.tsx` by integrating shared block components for better consistency and maintainability.

sites/src/index.css

@@ -1,3 +1,7 @@
+/* Import shared component styles */
+/* Note: Using relative path since @shared alias may not work in CSS */
+/* These will be imported via JavaScript instead */
+
 :root {
   font-family: 'Inter', 'Inter var', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
   color: #0f172a;