Implemented the Powerplant Production Planning API using FastAPI. The service calculates the optimal production plan for powerplants based on load, fuel prices, and operational constraints using a merit-order dispatch algorithm.

• Added POST /productionplan endpoint.
• Implemented production planning logic with pmin/pmax constraints and rebalancing.
• Added request/response validation with Pydantic.
• Added unit tests for validation and planning logic.
• Integrated Ruff for linting and formatting.
• Added Dockerfile for containerized execution.
• Included README with build and run instructions.