Dannke/Local_RAG_project ? reverse-engineered prompt

Build me a simple local document Q and A app in Python that lets me upload PDF, DOCX, TXT, and Markdown files, index them, and then ask questions about the content. I want a clean web interface where I can see the uploaded files, start indexing with a progress indicator, and then chat with the documents in Russian or English.

The answers should be based only on the uploaded files, with the app showing the most relevant chunks and where they came from, like file name and page info when available. Please make it stream the response so it feels live while it is thinking. I also want basic file management, like deleting one document or clearing all uploaded files, and the search index should update safely when files change. If you need to check current docs for any library setup, go ahead and look them up online.