Implement Stage 3: Enhance content metadata and validation features

- Added entity metadata fields to the Tasks model, including entity_type, taxonomy, and cluster_role.
- Updated CandidateEngine to prioritize content relevance based on cluster mappings.
- Introduced metadata completeness scoring in ContentAnalyzer.
- Enhanced validation services to check for entity type and mapping completeness.
- Updated frontend components to display and validate new metadata fields.
- Implemented API endpoints for content validation and metadata persistence.
- Migrated existing data to populate new metadata fields for Tasks and Content.

backend/igny8_core/business/site_building/services/page_generation_service.py

@@ -225,6 +225,38 @@ class PageGenerationService:
 
         keywords = self._build_keywords_hint(page_blueprint)
 
+        # Stage 3: Map page type to entity_type
+        entity_type_map = {
+            'home': 'page',
+            'about': 'page',
+            'services': 'service',
+            'products': 'product',
+            'blog': 'blog_post',
+            'contact': 'page',
+            'custom': 'page',
+        }
+        entity_type = entity_type_map.get(page_blueprint.type, 'page')
+        
+        # Stage 3: Try to find related cluster and taxonomy from blueprint
+        cluster_role = 'hub'  # Default
+        taxonomy = None
+        
+        # Find cluster link for this blueprint to infer role
+        from igny8_core.business.site_building.models import SiteBlueprintCluster
+        cluster_link = SiteBlueprintCluster.objects.filter(
+            site_blueprint=page_blueprint.site_blueprint
+        ).first()
+        if cluster_link:
+            cluster_role = cluster_link.role
+        
+        # Find taxonomy if page type suggests it (products/services)
+        if page_blueprint.type in ['products', 'services']:
+            from igny8_core.business.site_building.models import SiteBlueprintTaxonomy
+            taxonomy = SiteBlueprintTaxonomy.objects.filter(
+                site_blueprint=page_blueprint.site_blueprint,
+                taxonomy_type__in=['product_category', 'service_category']
+            ).first()
+        
         task = Tasks.objects.create(
             account=page_blueprint.account,
             site=page_blueprint.site,
@@ -235,6 +267,10 @@ class PageGenerationService:
             content_structure=self._map_content_structure(page_blueprint.type),
             content_type='article',
             status='queued',
+            # Stage 3: Set entity metadata
+            entity_type=entity_type,
+            taxonomy=taxonomy,
+            cluster_role=cluster_role,
         )
 
         logger.info(