chunlea/vercel-platforms-starter-kit ? reverse-engineered prompt

Build me a multi tenant blogging platform where each user can have their own subdomain and custom domain, with SSL handled automatically.

I want a clean public site for each tenant that shows blog posts, supports fast loading, dark mode, custom fonts and metadata, and generates nice social share images for posts. It should also have a simple admin area where people can sign in, create and edit posts in a Notion style editor, upload images by dragging or pasting them in, and preview changes before publishing.

Use a modern full stack Next.js setup and make it feel polished and production ready. If you need to check current docs for the domain or image features, go ahead and look them up online.