- Switch build stage from Bun to Node.js to avoid AVX CPU requirement
- Use Node.js 20 Alpine for building React client (Vite)
- Keep Bun runtime for API server (no AVX needed for runtime)
- Update README.md with build strategy and troubleshooting
- Update CLAUDE.md with Docker architecture documentation
- Add comprehensive docs/DOCKER_BUILD_FIX.md with technical details
Fixes#14 - Docker build crashes with "CPU lacks AVX support"
Tested:
- Docker build: SUCCESS
- Container runtime: SUCCESS
- Health check: PASS
- React client serving: PASS
