The healthcheck was using localhost which resolves to IPv6 [::1],
but Next.js only listens on IPv4. Changed to 127.0.0.1.
Also removed deprecated 'version' key from docker-compose.yml.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>