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/modules/planner/views.py

@@ -1011,6 +1011,7 @@ class ContentIdeasViewSet(SiteSectorModelViewSet):
         
         created_tasks = []
         for idea in ideas:
+            # Stage 3: Inherit metadata from idea
             task = Tasks.objects.create(
                 title=idea.idea_title,
                 description=idea.description or '',
@@ -1023,6 +1024,10 @@ class ContentIdeasViewSet(SiteSectorModelViewSet):
                 account=idea.account,
                 site=idea.site,
                 sector=idea.sector,
+                # Stage 3: Inherit entity metadata
+                entity_type=idea.site_entity_type or 'blog_post',
+                taxonomy=idea.taxonomy,
+                cluster_role=idea.cluster_role or 'hub',
             )
             created_tasks.append(task.id)
             # Update idea status