Chmod +x gradio-ui.py

Add multi-provider LLM support (OpenAI, Anthropic, Gemini, Databricks, Ollama)

Fixed confirm button

Merge branch 'main' of https://github.com/stefanches7/AI-assisted-Neuroimaging-harmonization

updated gradio ui

OpenAI key in a sep row, better descriptions for the fields

pass openai api key with a window in gradio; pass openai key directly to the LLM agent constructor

make ui code filename more verbal