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/nginx/nginx.conf

@@ -0,0 +1,74 @@
+# Nginx Configuration for Document Translation API
+# Production-ready with SSL, caching, and security headers
+
+user nginx;
+worker_processes auto;
+error_log /var/log/nginx/error.log warn;
+pid /var/run/nginx.pid;
+
+events {
+    worker_connections 1024;
+    use epoll;
+    multi_accept on;
+}
+
+http {
+    include /etc/nginx/mime.types;
+    default_type application/octet-stream;
+
+    # Logging format
+    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
+                    '$status $body_bytes_sent "$http_referer" '
+                    '"$http_user_agent" "$http_x_forwarded_for" '
+                    'rt=$request_time uct="$upstream_connect_time" '
+                    'uht="$upstream_header_time" urt="$upstream_response_time"';
+
+    access_log /var/log/nginx/access.log main;
+
+    # Performance optimizations
+    sendfile on;
+    tcp_nopush on;
+    tcp_nodelay on;
+    keepalive_timeout 65;
+    types_hash_max_size 2048;
+
+    # Gzip compression
+    gzip on;
+    gzip_vary on;
+    gzip_proxied any;
+    gzip_comp_level 6;
+    gzip_types text/plain text/css text/xml application/json application/javascript 
+               application/xml application/rss+xml application/atom+xml image/svg+xml;
+
+    # File upload size (for document translation)
+    client_max_body_size 100M;
+    client_body_timeout 300s;
+    client_header_timeout 60s;
+
+    # Proxy settings
+    proxy_connect_timeout 60s;
+    proxy_send_timeout 300s;
+    proxy_read_timeout 300s;
+    proxy_buffer_size 128k;
+    proxy_buffers 4 256k;
+    proxy_busy_buffers_size 256k;
+
+    # Rate limiting zones
+    limit_req_zone $binary_remote_addr zone=api_limit:10m rate=10r/s;
+    limit_req_zone $binary_remote_addr zone=upload_limit:10m rate=2r/s;
+    limit_conn_zone $binary_remote_addr zone=conn_limit:10m;
+
+    # Upstream definitions
+    upstream backend {
+        server backend:8000;
+        keepalive 32;
+    }
+
+    upstream frontend {
+        server frontend:3000;
+        keepalive 32;
+    }
+
+    # Include additional configs
+    include /etc/nginx/conf.d/*.conf;
+}