fix: bind to 0.0.0.0 on HF Spaces; move CSS to launch()

fix: strip CUDA/NVIDIA wheels (Space is CPU-only)

fix: relax pydantic pin to satisfy gradio[mcp]==6.14.0

Deploy chatbot: code + RAG + Qwen (3 BERT classifiers loaded from HF Hub)

initial commit

Duplicate from gradio-templates/chatbot