This commit cleans up the `docker-compose.prod.yml` file by removing the database, Redis, and frontend service configurations, which were deemed unnecessary. The backend service configuration has been streamlined, including the update of the `VITE_API_URL` environment variable. This refactor aims to enhance clarity and maintainability of the Docker setup.
- Changed the frontend Dockerfile to use process.env for environment variables instead of direct interpolation.
- Updated the production Docker Compose file to set environment variables directly instead of using build args.
- Switched the backend Dockerfile base image from `python:3.11-slim` to `python:alpine` for a smaller image size and increased worker count from 4 to 8 for better performance.
- Introduced `docker-compose.prod.yml` to define services for production deployment, including PostgreSQL, FastAPI backend, frontend, and Redis.
- Created `env.production.template` to outline necessary environment variables for production, ensuring sensitive data is not committed.
- Added `PRODUCTION.md` as a deployment guide detailing the setup process using Docker Compose and Gitea Actions for CI/CD.
- Implemented Gitea workflows for build, test, and deployment processes to streamline production updates.
- Updated backend and frontend Dockerfiles for optimized production builds and configurations.
- Enhanced application settings to support environment-specific configurations, including CORS and health checks.
