Refactor WordPress integration service to use API key for connection testing

- Updated the `IntegrationService` to perform connection tests using only the API key, removing reliance on username and app password.
- Simplified health check logic and improved error messaging for better clarity.
- Added functionality to revoke API keys in the `WordPressIntegrationForm` component.
- Enhanced site settings page with a site selector and improved integration status display.
- Cleaned up unused code and improved overall structure for better maintainability.

backend/igny8_core/modules/integration/views.py

@@ -27,6 +27,27 @@ class IntegrationViewSet(SiteSectorModelViewSet):
     throttle_scope = 'integration'
     throttle_classes = [DebugScopedRateThrottle]
     
+    def get_queryset(self):
+        """
+        Override to filter integrations by site.
+        SiteIntegration only has 'site' field (no 'sector'), so SiteSectorModelViewSet's
+        filtering doesn't apply. We manually filter by site here.
+        """
+        queryset = super().get_queryset()
+        
+        # Get site parameter from query params
+        site_id = self.request.query_params.get('site_id') or self.request.query_params.get('site')
+        
+        if site_id:
+            try:
+                site_id_int = int(site_id)
+                queryset = queryset.filter(site_id=site_id_int)
+            except (ValueError, TypeError):
+                # Invalid site_id, return empty queryset
+                queryset = queryset.none()
+        
+        return queryset
+    
     def get_serializer_class(self):
         from rest_framework import serializers