feat: Add complete production deployment infrastructure

- Docker configuration:
  - Multi-stage Dockerfiles for backend (Python 3.11) and frontend (Node 20)
  - Production docker-compose.yml with all services
  - Development docker-compose.dev.yml with hot-reload

- Nginx reverse proxy:
  - SSL/TLS termination with modern cipher suites
  - Rate limiting and security headers
  - Caching and compression
  - Load balancing ready

- Kubernetes manifests:
  - Deployment, Service, Ingress configurations
  - ConfigMap and Secrets
  - HPA for auto-scaling
  - PersistentVolumeClaims

- Deployment scripts:
  - deploy.sh: Automated deployment with health checks
  - backup.sh: Automated backup with retention
  - health-check.sh: Service health monitoring
  - setup-ssl.sh: Let's Encrypt SSL automation

- Monitoring:
  - Prometheus configuration
  - Grafana dashboards (optional)
  - Structured logging

- Documentation:
  - DEPLOYMENT_GUIDE.md: Complete deployment instructions
  - Environment templates (.env.production)

Ready for commercial deployment!

.env.production

@@ -0,0 +1,75 @@
+# ============================================
+# Document Translation API - Production Environment
+# ============================================
+# IMPORTANT: Review and update all values before deployment
+
+# ===========================================
+# Application Settings
+# ===========================================
+APP_NAME=Document Translation API
+APP_ENV=production
+DEBUG=false
+LOG_LEVEL=INFO
+
+# ===========================================
+# Server Configuration
+# ===========================================
+HTTP_PORT=80
+HTTPS_PORT=443
+BACKEND_PORT=8000
+FRONTEND_PORT=3000
+
+# ===========================================
+# Domain Configuration
+# ===========================================
+DOMAIN=translate.yourdomain.com
+NEXT_PUBLIC_API_URL=https://translate.yourdomain.com
+
+# ===========================================
+# Translation Service Configuration
+# ===========================================
+TRANSLATION_SERVICE=ollama
+OLLAMA_BASE_URL=http://ollama:11434
+OLLAMA_MODEL=llama3
+
+# DeepL API (optional)
+DEEPL_API_KEY=
+
+# OpenAI API (optional)
+OPENAI_API_KEY=
+OPENAI_MODEL=gpt-4o-mini
+
+# ===========================================
+# File Upload Settings
+# ===========================================
+MAX_FILE_SIZE_MB=50
+ALLOWED_EXTENSIONS=.docx,.xlsx,.pptx
+
+# ===========================================
+# Rate Limiting
+# ===========================================
+RATE_LIMIT_ENABLED=true
+RATE_LIMIT_REQUESTS_PER_MINUTE=60
+RATE_LIMIT_TRANSLATIONS_PER_MINUTE=10
+RATE_LIMIT_TRANSLATIONS_PER_HOUR=100
+RATE_LIMIT_TRANSLATIONS_PER_DAY=500
+
+# ===========================================
+# Security (CHANGE THESE!)
+# ===========================================
+ADMIN_USERNAME=admin
+ADMIN_PASSWORD=CHANGE_THIS_SECURE_PASSWORD
+
+# CORS Configuration
+CORS_ORIGINS=https://translate.yourdomain.com
+
+# ===========================================
+# Monitoring (Optional)
+# ===========================================
+GRAFANA_USER=admin
+GRAFANA_PASSWORD=CHANGE_THIS_TOO
+
+# ===========================================
+# SSL Configuration
+# ===========================================
+LETSENCRYPT_EMAIL=admin@yourdomain.com