Load MedlinePlus prebuilt corpus when present, fall back to sample; add MedlinePlus attribution

Drop unsupported type='messages' kwarg for installed Gradio version

Fix unterminated f-string literals (escape newlines)

Switch to lightweight publishable RAG demo (sample corpus + hosted gen)

Add RAG pipeline with FetchMerck_AI Mistral-7B GGUF + FAISS retriever

Duplicate from gradio-templates/chatbot