Use Gradio 5.9.1 with simplified ChatInterface

Fix: Quote Python version 3.10

Fix Python version format to string

Rebuild with Gradio 4.19.2 and Python 3.10

Use stable Gradio 4.19.2 with Python 3.10

Fix: Use Python 3.11 to avoid audioop removal in 3.13

Fix Gradio version compatibility

Initial commit - Customer Support Chatbot with RAG