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!

docker-compose.dev.yml

@@ -0,0 +1,40 @@
+# Document Translation API - Development Docker Compose
+# Usage: docker-compose -f docker-compose.yml -f docker-compose.dev.yml up
+
+version: '3.8'
+
+services:
+  backend:
+    build:
+      context: .
+      dockerfile: docker/backend/Dockerfile
+      target: builder  # Use builder stage for dev
+    volumes:
+      - .:/app
+      - /app/venv  # Don't override venv
+    environment:
+      - DEBUG=true
+      - LOG_LEVEL=DEBUG
+    command: uvicorn main:app --host 0.0.0.0 --port 8000 --reload
+    ports:
+      - "8000:8000"
+
+  frontend:
+    build:
+      context: .
+      dockerfile: docker/frontend/Dockerfile
+      target: builder
+    volumes:
+      - ./frontend:/app
+      - /app/node_modules
+      - /app/.next
+    environment:
+      - NODE_ENV=development
+    command: npm run dev
+    ports:
+      - "3000:3000"
+
+  # No nginx in dev - direct access to services
+  nginx:
+    profiles:
+      - disabled