refactor: Overhaul Gradio UI with professional two-column layout and collapsible sidebar

feat: Update models to Feb 2026 standards and fix local model

Update ocs4dev.py

Update ocs4dev.py

Update ocs4dev.py

Update app.py

Rename app_py.py to app.py

Update app_py.py

Update README.md

Update README.md

Upload 6 files

initial commit