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!

scripts/health-check.sh

@@ -0,0 +1,87 @@
+#!/bin/bash
+# ============================================
+# Document Translation API - Health Check Script
+# ============================================
+# Usage: ./scripts/health-check.sh [--verbose]
+
+set -e
+
+VERBOSE=false
+if [ "$1" == "--verbose" ]; then
+    VERBOSE=true
+fi
+
+# Colors
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+# Configuration
+BACKEND_URL="${BACKEND_URL:-http://localhost:8000}"
+FRONTEND_URL="${FRONTEND_URL:-http://localhost:3000}"
+NGINX_URL="${NGINX_URL:-http://localhost}"
+
+EXIT_CODE=0
+
+check_service() {
+    local name=$1
+    local url=$2
+    local expected=${3:-200}
+    
+    response=$(curl -s -o /dev/null -w "%{http_code}" "$url" 2>/dev/null || echo "000")
+    
+    if [ "$response" == "$expected" ]; then
+        echo -e "${GREEN}✓ $name: OK (HTTP $response)${NC}"
+    else
+        echo -e "${RED}✗ $name: FAILED (HTTP $response, expected $expected)${NC}"
+        EXIT_CODE=1
+    fi
+    
+    if [ "$VERBOSE" == "true" ] && [ "$response" == "200" ]; then
+        echo "  Response:"
+        curl -s "$url" 2>/dev/null | head -c 500
+        echo ""
+    fi
+}
+
+echo "========================================="
+echo "  Health Check - Document Translation API"
+echo "========================================="
+echo ""
+
+# Check backend
+echo "Backend Services:"
+check_service "API Health" "$BACKEND_URL/health"
+check_service "API Root" "$BACKEND_URL/"
+
+echo ""
+
+# Check frontend
+echo "Frontend Services:"
+check_service "Frontend" "$FRONTEND_URL"
+
+echo ""
+
+# Check nginx (if running)
+echo "Proxy Services:"
+check_service "Nginx" "$NGINX_URL/health"
+
+echo ""
+
+# Docker health
+if command -v docker &> /dev/null; then
+    echo "Docker Container Status:"
+    docker compose ps --format "table {{.Name}}\t{{.Status}}" 2>/dev/null || echo "  Docker Compose not running"
+fi
+
+echo ""
+echo "========================================="
+
+if [ $EXIT_CODE -eq 0 ]; then
+    echo -e "${GREEN}All health checks passed!${NC}"
+else
+    echo -e "${RED}Some health checks failed!${NC}"
+fi
+
+exit $EXIT_CODE