Add production Docker deployment configuration

- Add multi-stage Dockerfile for Next.js standalone build
- Add docker-compose.deploy.yml for production deployment
- Add entrypoint.sh for database migration and startup
- Add .dockerignore for efficient Docker builds
- Add docker/.env.production with all required env vars
- Add Caddyfile.prod with security headers and optimizations
- Update next.config.ts with output: standalone for Docker
- Add DOCKER_DEPLOYMENT.md with comprehensive deployment guide

.dockerignore

@@ -0,0 +1,15 @@
+.git
+.gitignore
+README.md
+.env.local
+.env.*.local
+node_modules
+npm-debug.log
+coverage
+.turbo
+.next
+dist
+.DS_Store
+.vscode
+.idea
+*.log