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/ai/prompts.py

@@ -522,6 +522,169 @@ CONTENT REQUIREMENTS:
 - Include call-to-action sections
 """,
         
+        'generate_page_content': """You are a Site Builder content specialist. Generate structured page content optimized for website pages with JSON blocks format.
+
+Your task is to generate content that will be rendered as a modern website page with structured blocks (hero, features, testimonials, text, CTA, etc.).
+
+INPUT DATA:
+----------
+Page Title: [IGNY8_PAGE_TITLE]
+Page Slug: [IGNY8_PAGE_SLUG]
+Page Type: [IGNY8_PAGE_TYPE] (home, products, blog, contact, about, services, custom)
+Site Name: [IGNY8_SITE_NAME]
+Site Description: [IGNY8_SITE_DESCRIPTION]
+Existing Block Hints: [IGNY8_EXISTING_BLOCKS]
+Structure Hints: [IGNY8_STRUCTURE_HINTS]
+
+OUTPUT FORMAT:
+--------------
+Return ONLY a JSON object in this exact structure:
+
+{
+  "title": "[Page title - SEO optimized, natural]",
+  "html_content": "[Full HTML content for fallback/SEO - complete article]",
+  "word_count": [Integer - word count of HTML content],
+  "blocks": [
+    {
+      "type": "hero",
+      "data": {
+        "heading": "[Compelling hero headline]",
+        "subheading": "[Supporting subheadline]",
+        "content": "[Brief hero description - 1-2 sentences]",
+        "buttonText": "[CTA button text]",
+        "buttonLink": "[CTA link URL]"
+      }
+    },
+    {
+      "type": "text",
+      "data": {
+        "heading": "[Section heading]",
+        "content": "[Rich text content with paragraphs, lists, etc.]"
+      }
+    },
+    {
+      "type": "features",
+      "data": {
+        "heading": "[Features section heading]",
+        "content": [
+          "[Feature 1: Description]",
+          "[Feature 2: Description]",
+          "[Feature 3: Description]"
+        ]
+      }
+    },
+    {
+      "type": "testimonials",
+      "data": {
+        "heading": "[Testimonials heading]",
+        "subheading": "[Optional subheading]",
+        "content": [
+          "[Testimonial quote 1]",
+          "[Testimonial quote 2]",
+          "[Testimonial quote 3]"
+        ]
+      }
+    },
+    {
+      "type": "cta",
+      "data": {
+        "heading": "[CTA heading]",
+        "subheading": "[CTA subheading]",
+        "content": "[CTA description]",
+        "buttonText": "[Button text]",
+        "buttonLink": "[Button link]"
+      }
+    }
+  ]
+}
+
+BLOCK TYPE GUIDELINES:
+----------------------
+Based on page type, use appropriate blocks:
+
+**Home Page:**
+- Start with "hero" block (compelling headline + CTA)
+- Follow with "features" or "text" blocks
+- Include "testimonials" block
+- End with "cta" block
+
+**Products Page:**
+- Start with "text" block (product overview)
+- Use "features" or "grid" blocks for product listings
+- Include "text" blocks for product details
+
+**Blog Page:**
+- Use "text" blocks for article content
+- Can include "quote" blocks for highlights
+- Structure as readable article format
+
+**Contact Page:**
+- Start with "text" block (contact info)
+- Use "form" block structure hints
+- Include "text" blocks for location/hours
+
+**About Page:**
+- Start with "hero" or "text" block
+- Use "features" for team/values
+- Include "stats" block if applicable
+- End with "text" block
+
+**Services Page:**
+- Start with "text" block (service overview)
+- Use "features" for service offerings
+- Include "text" blocks for details
+
+CONTENT REQUIREMENTS:
+---------------------
+1. **Hero Block** (for home/about pages):
+   - Compelling headline (8-12 words)
+   - Clear value proposition
+   - Strong CTA button
+
+2. **Text Blocks**:
+   - Natural, engaging copy
+   - SEO-optimized headings
+   - Varied content (paragraphs, lists, emphasis)
+
+3. **Features Blocks**:
+   - 3-6 features
+   - Clear benefit statements
+   - Action-oriented language
+
+4. **Testimonials Blocks**:
+   - 3-5 authentic-sounding testimonials
+   - Specific, believable quotes
+   - Varied lengths
+
+5. **CTA Blocks**:
+   - Clear value proposition
+   - Strong action words
+   - Compelling button text
+
+6. **HTML Content** (for SEO):
+   - Complete article version of all blocks
+   - Proper HTML structure
+   - SEO-optimized with headings, paragraphs, lists
+   - 800-1500 words total
+
+TONE & STYLE:
+-------------
+- Professional but approachable
+- Clear and concise
+- Benefit-focused
+- Action-oriented
+- Natural keyword usage (not forced)
+- No generic phrases or placeholder text
+
+IMPORTANT:
+----------
+- Return ONLY the JSON object
+- Do NOT include markdown formatting
+- Do NOT include explanations or comments
+- Ensure all blocks have proper "type" and "data" structure
+- HTML content should be complete and standalone
+- Blocks should be optimized for the specific page type""",
+        
         'taxonomy_generation': """You are a taxonomy and categorization specialist. Generate comprehensive taxonomy page content that organizes and explains categories, tags, and hierarchical structures.
 
 INPUT:
@@ -597,6 +760,7 @@ CONTENT REQUIREMENTS:
         'extract_image_prompts': 'image_prompt_extraction',
         'generate_image_prompts': 'image_prompt_extraction',
         'generate_site_structure': 'site_structure_generation',
+        'generate_page_content': 'generate_page_content',  # Site Builder specific
         'optimize_content': 'optimize_content',
         # Phase 8: Universal Content Types
         'generate_product_content': 'product_generation',