redesign UI with dark cohesive theme

redesign UI with dark cohesive theme

improve UI design

save local changes

fix router, schema, prompts and examples

Upload northwind.db with huggingface_hub

Update .gitignore

Upload northwind_info.pdf with huggingface_hub

Upload northwind_employee_promotions.pdf with huggingface_hub

Update README.md

add pyaudioop for python 3.13

add pyaudioop for python 3.13

upgrade to gradio 5 for python 3.13 compatibility

use python 3.11 via dockerfile

remove gradio from requirements, let HF manage it

fix gradio version for python 3.13

fix readme metadata

resolve readme conflict

initial commit

initial commit