[TR-0001] Add Docker setup for unified local development #17
Description
Provide a Dockerfile and (if necessary) a docker-compose.yml to support local setup for both frontend and backend components. The setup should allow developers to launch the environment with a single command and prepare for later deployment modes.
Definition of Ready:
- This issue is labeled with TR-0001 and 'status:Backlog'.
- Clarity about which components are to be containerized.
- Task is sized for a single developer.
Definition of Done:
- Dockerfile(s) and/or docker-compose.yml in repo.
- Verified that frontend and backend start together locally.
- Readme updated with new setup/launch instructions.
- Product Owner review/accepts containerization approach.