Update app.py

Pin FastAPI Starlette stack for Gradio 4 compatibility

Replace Chatbot component with stable transcript UI

Use custom chatbot layout with explicit visible text styles

Improve Space text contrast and readability

Fix ChatInterface examples format

Pin huggingface-hub for Gradio 5 HfFolder compatibility

Convert TinyLLM demo to chatbot UI and pin Python 3.11

Fix Python 3.13 pydub audioop dependency

Add TinyLLM Gradio demo Space

initial commit