Fix API endpoints - use correct backend endpoints (/upload-dataset and /process-pipeline)

Update Streamlit app to support deployed backend with fallback to localhost

Deploy working Streamlit version - exact local version that works perfectly

Fix Gradio schema error - simplify to Interface API to avoid complex schema generation

Fix Gradio Markdown parameter - remove unsupported unsafe_allow_html

Improve UI/UX - add custom CSS styling and better layout

Fix Gradio Dataframe parameter - remove unsupported max_rows

Fix Gradio compatibility - update to latest version

Deploy PromptPrepML - Standalone Gradio App with ML Preprocessing