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/backup.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+# ============================================
+# Document Translation API - Backup Script
+# ============================================
+# Usage: ./scripts/backup.sh [backup_dir]
+
+set -e
+
+# Configuration
+BACKUP_DIR="${1:-./backups}"
+TIMESTAMP=$(date +%Y%m%d_%H%M%S)
+BACKUP_NAME="translate_backup_$TIMESTAMP"
+
+# Colors
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+echo -e "${YELLOW}Starting backup: $BACKUP_NAME${NC}"
+
+# Create backup directory
+mkdir -p "$BACKUP_DIR/$BACKUP_NAME"
+
+# Backup uploaded files
+if [ -d "./uploads" ]; then
+    echo "Backing up uploads..."
+    cp -r ./uploads "$BACKUP_DIR/$BACKUP_NAME/"
+fi
+
+# Backup output files
+if [ -d "./outputs" ]; then
+    echo "Backing up outputs..."
+    cp -r ./outputs "$BACKUP_DIR/$BACKUP_NAME/"
+fi
+
+# Backup configuration
+echo "Backing up configuration..."
+cp .env* "$BACKUP_DIR/$BACKUP_NAME/" 2>/dev/null || true
+cp docker-compose*.yml "$BACKUP_DIR/$BACKUP_NAME/" 2>/dev/null || true
+
+# Backup Docker volumes (if using Docker)
+if command -v docker &> /dev/null; then
+    echo "Backing up Docker volumes..."
+    
+    # Get volume names
+    VOLUMES=$(docker volume ls --format "{{.Name}}" | grep translate || true)
+    
+    for vol in $VOLUMES; do
+        echo "  Backing up volume: $vol"
+        docker run --rm \
+            -v "$vol:/data:ro" \
+            -v "$(pwd)/$BACKUP_DIR/$BACKUP_NAME:/backup" \
+            alpine tar czf "/backup/${vol}.tar.gz" -C /data . 2>/dev/null || true
+    done
+fi
+
+# Compress backup
+echo "Compressing backup..."
+cd "$BACKUP_DIR"
+tar czf "${BACKUP_NAME}.tar.gz" "$BACKUP_NAME"
+rm -rf "$BACKUP_NAME"
+
+# Cleanup old backups (keep last 7)
+echo "Cleaning old backups..."
+ls -t translate_backup_*.tar.gz 2>/dev/null | tail -n +8 | xargs rm -f 2>/dev/null || true
+
+echo -e "${GREEN}Backup complete: $BACKUP_DIR/${BACKUP_NAME}.tar.gz${NC}"