Update indexes, add multi lang / sitemap support.

I've been testing this over the past few days – really cool stuff!
I did notice a few things I’d love to see, like the ability to re-scrape an index to update the DB, add XML sitemaps, and support multiple languages.

Also, to use GPT-5 (cheaper than 4o), I had to tweak a few settings.

As a test, I even built a simple chat widget for a client:
https://chat-widget-test.netlify.app/en (WIP).

Is there a roadmap for future improvements, or is the project considered feature-complete as it is?

Thanks for the work!