E-commerce category/product mapping in the UI

1. Include all landing pages with their main target keywords and search volumes.

2. Reflect that the client’s site is an e-commerce business, meaning the main SEO target pages are categories and subcategories.

3. Show clear relationships between all product pages (categories → subcategories → product pages) in a structured hierarchy.

P.S. This is already happening in the backend keywords workflow, serving as a foundation for the new e-commerce keywords workflow, but of course should be layed out well in the UI too.