IntelligenzaArtificiale/Free-personal-AI-Assistant-with-plugin ? reverse-engineered prompt

Build me a simple web app that feels like a free ChatGPT alternative, but with extra tools built in. I want a chat interface where I can ask questions and also use plugins for web search, talking with PDFs, DOCX and TXT files, YouTube videos, audio files, website scraping, data files, and a custom knowledge mode for a topic I choose.

It should be easy to run locally, and if possible have a clean Streamlit style page with upload buttons, plugin choices, and a chat history area that keeps the conversation going. Make the app explain what each tool does in a friendly way, and show answers clearly with sources or summaries when it can. If something needs current docs or APIs, look them up online if needed.

Please keep it lightweight and practical, so someone can install it, run it, and start chatting with files or the web right away.