Add generate_page_content functionality for structured page content generation

- Introduced a new AI function `generate_page_content` to create structured content for website pages using JSON blocks.
- Updated `AIEngine` to handle the new function and return appropriate messages for content generation.
- Enhanced `PageGenerationService` to utilize the new AI function for generating page content based on blueprints.
- Modified `prompts.py` to include detailed content generation requirements for the new function.
- Updated site rendering logic to accommodate structured content blocks in various layouts.

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

@@ -105,6 +105,7 @@ class SitesRendererAdapter(BaseAdapter):
     def _build_site_definition(self, site_blueprint: SiteBlueprint) -> Dict[str, Any]:
         """
         Build site definition JSON from blueprint.
+        Merges actual Content from Writer into PageBlueprint blocks.
         
         Args:
             site_blueprint: SiteBlueprint instance
@@ -112,15 +113,55 @@ class SitesRendererAdapter(BaseAdapter):
         Returns:
             dict: Site definition structure
         """
+        from igny8_core.business.content.models import Tasks, Content
+        
         # Get all pages
         pages = []
         for page in site_blueprint.pages.all().order_by('order'):
+            # Get blocks from blueprint (placeholders)
+            blocks = page.blocks_json or []
+            
+            # Try to find actual Content from Writer
+            # PageBlueprint -> Task (by title pattern) -> Content
+            task_title = f"[Site Builder] {page.title or page.slug.replace('-', ' ').title()}"
+            task = Tasks.objects.filter(
+                account=page.account,
+                site=page.site,
+                sector=page.sector,
+                title=task_title
+            ).first()
+            
+            # If task exists, get its Content
+            if task and hasattr(task, 'content_record'):
+                content = task.content_record
+                # If content is published, merge its blocks
+                if content and content.status == 'publish' and content.json_blocks:
+                    # Merge Content.json_blocks into PageBlueprint.blocks_json
+                    # Content blocks take precedence over blueprint placeholders
+                    blocks = content.json_blocks
+                    logger.info(
+                        f"[SitesRendererAdapter] Using published Content blocks for page {page.slug} "
+                        f"(Content ID: {content.id})"
+                    )
+                elif content and content.status == 'publish' and content.html_content:
+                    # If no json_blocks but has html_content, convert to text block
+                    blocks = [{
+                        'type': 'text',
+                        'data': {
+                            'content': content.html_content,
+                            'title': content.title or page.title
+                        }
+                    }]
+                    logger.info(
+                        f"[SitesRendererAdapter] Converted HTML content to text block for page {page.slug}"
+                    )
+            
             pages.append({
                 'id': page.id,
                 'slug': page.slug,
                 'title': page.title,
                 'type': page.type,
-                'blocks': page.blocks_json,
+                'blocks': blocks,
                 'status': page.status,
             })