Add DEPLOYMENT.md and ModelCard.md for production documentation

Fix: merge CI workflows, fix Codecov token, ignore test_pipeline.py

Fix: use RAG_CODECOV_KEY secret for Codecov upload

Fix: upgrade CI actions to v4/v5, fix Codecov upload

Add src modules, tests, CI workflow, and Codecov config

Cleanup repository and set up automated Hugging Face sync

Fix workflow location - move to .github/workflows/

Fix numpy version, imports, optimized Docker setup, and CI Pipeline