Created comprehensive deployment guide with:
- DEPLOYMENT.md: Full documentation covering server requirements,
step-by-step deployment, troubleshooting, and project structure
- scripts/nginx-template.conf: Nginx configuration with SSL, reverse
proxy to backend, and frontend static file serving
- scripts/systemd-template.service: Systemd service for auto-restart
and environment variable management
- scripts/deploy.sh: Automated deployment script for rolling updates
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