Generate New Page

Start AI page generation job (async with progress tracking).

This endpoint creates a background job that will:

1. Fetch the existing website theme and blocks
2. Use AI to generate a complete page based on user instructions
3. Maintain consistency with the website's existing theme and design
4. Follow all UI/UX rules and constraints
5. Save the page to database and upload to S3

Returns a job_id that can be used to check generation status via: GET /api/websites/{website_id}/pages/generate/{job_id}

Example instructions:

• "Create a services page showcasing our auto repair services"
• "Generate a financing page explaining our payment options"
• "Create a team page with profiles of our mechanics"