- Add multi-platform Docker build support with docker-bake.hcl
- Update Dockerfile with improved production build configurations
- Enhance Makefile with streamlined deployment targets for local, dev, and prod
- Improve buildx-helper.sh script for better cross-platform builds
- Fix production build security validations for JWT_SECRET and SESSION_SECRET
- Add comprehensive deployment documentation and environment setup guides
These changes enable efficient multi-platform image creation and provide
clear deployment workflows for different environments.