Add Sites Renderer service to Docker Compose and implement public endpoint for site definitions

- Introduced `igny8_sites` service in `docker-compose.app.yml` for serving deployed public sites.
- Updated `SitesRendererAdapter` to construct deployment URLs dynamically based on environment variables.
- Added `SiteDefinitionView` to provide a public API endpoint for retrieving deployed site definitions.
- Enhanced `loadSiteDefinition` function to prioritize API calls for site definitions over filesystem access.
- Updated frontend to utilize the new API endpoint for loading site definitions.

backend/igny8_core/business/publishing/services/adapters/sites_renderer_adapter.py

@@ -198,10 +198,16 @@ class SitesRendererAdapter(BaseAdapter):
         Returns:
             str: Deployment URL
         """
-        # TODO: Implement URL generation based on site configuration
-        # For now, return placeholder
         site_id = site_blueprint.site.id
-        return f"https://{site_id}.igny8.com"  # Placeholder
+        
+        # Get Sites Renderer URL from environment or use default
+        sites_renderer_host = os.getenv('SITES_RENDERER_HOST', '31.97.144.105')
+        sites_renderer_port = os.getenv('SITES_RENDERER_PORT', '8024')
+        sites_renderer_protocol = os.getenv('SITES_RENDERER_PROTOCOL', 'http')
+        
+        # Construct URL: http://31.97.144.105:8024/{site_id}
+        # Sites Renderer routes: /:siteId/* -> SiteRenderer component
+        return f"{sites_renderer_protocol}://{sites_renderer_host}:{sites_renderer_port}/{site_id}"
     
     # BaseAdapter interface implementation
     def publish(