Remove legacy files and configurations: delete .gitattributes, .gitignore, Dockerfile, Alembic configurations, database handling, and FastAPI app structure to streamline project setup.

Enhance database URL handling: add settings to extract database URL from payload, implement tunnel URL expansion, and normalize connection URLs for SQLAlchemy.

Refactor Dockerfile and application structure: switch to Python base image, remove supervisord, and implement Alembic for database migrations; add FastAPI app with forex forecast feature and update requirements