Implement Stage 3: Enhance content generation and metadata features

- Updated AI prompts to include metadata context, cluster roles, and product attributes for improved content generation.
- Enhanced GenerateContentFunction to incorporate taxonomy and keyword objects for richer context.
- Introduced new metadata fields in frontend components for better content organization and filtering.
- Added cluster match, taxonomy match, and relevance score to LinkResults for improved link management.
- Implemented metadata completeness scoring and recommended actions in AnalysisPreview for better content optimization.
- Updated API services to support new metadata structures and site progress tracking.

refactor-plan/refactor-stage-3-completion-status.md

@@ -25,7 +25,7 @@ Propagate the new metadata (clusters, taxonomies, entity types, attributes) thro
 | **Ideas → Tasks** | ✅ Complete | `backend/igny8_core/modules/planner/views.py` | `bulk_queue_to_writer()` inherits `entity_type`, `taxonomy`, `cluster_role` from Ideas |
 | **PageBlueprint → Tasks** | ✅ Complete | `backend/igny8_core/business/site_building/services/page_generation_service.py` | `_create_task_from_page()` sets metadata from blueprint |
 | **Tasks → Content** | ✅ Complete | `backend/igny8_core/business/content/services/metadata_mapping_service.py` | `MetadataMappingService` persists cluster/taxonomy/attribute mappings |
-| **AI Prompts** | ⚠️ **Pending** | `backend/igny8_core/ai/prompts.py` | Prompts need to include cluster role, taxonomy context, product attributes |
+| **AI Prompts** | ✅ **Complete** | `backend/igny8_core/ai/prompts.py` | Updated content generation prompt to include cluster role, taxonomy context, product attributes |
 
 ### 3. Validation Services