Deploy Gradio app to HF Spaces

Add CI, typed ORM models, and packaging cleanup

Restructure to api/src and add Streamlit UI

Restructure project layout, modernize stack, and clean up deprecated code

Refactor project structure

Apply lint fixes and minor refactors

Refactor API and training scripts

Restructure project and add ML model modules

feat: Phase 8 - final evaluation and portfolio polish

feat: Phase 3 - baseline and XLM-R fine-tuning

feat: Phase 2 - preprocessing and EDA pipeline

feat: Phase 1 - project scaffold and data download