Add Docker deployment and CI/CD configuration

- Add Dockerfile for multi-stage build
- Add docker-compose.yml for easy deployment
- Add Gitea Actions CI/CD workflow
- Add deployment script (deploy.sh)
- Add nginx and supervisord configuration
- Add deployment documentation

Deployment target: 192.168.9.149:8080

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

docker/supervisord.conf

@@ -0,0 +1,20 @@
+[supervisord]
+nodaemon=true
+logfile=/var/log/supervisor/supervisord.log
+pidfile=/var/run/supervisord.pid
+
+[program:nginx]
+command=/usr/sbin/nginx -g 'daemon off;'
+autostart=true
+autorestart=true
+stdout_logfile=/var/log/nginx/stdout.log
+stderr_logfile=/var/log/nginx/stderr.log
+
+[program:backend]
+command=node /app/backend/dist/main.js
+directory=/app/backend
+autostart=true
+autorestart=true
+stdout_logfile=/var/log/backend/stdout.log
+stderr_logfile=/var/log/backend/stderr.log
+environment=NODE_ENV="production",PORT="3000"