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/backend/Dockerfile

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+# Document Translation API - Backend Dockerfile
+# Multi-stage build for optimized production image
+
+FROM python:3.11-slim as builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    libmagic1 \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements first for better caching
+COPY requirements.txt .
+
+# Create virtual environment and install dependencies
+RUN python -m venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
+RUN pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir -r requirements.txt
+
+# Production stage
+FROM python:3.11-slim as production
+
+WORKDIR /app
+
+# Install runtime dependencies only
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libmagic1 \
+    curl \
+    && rm -rf /var/lib/apt/lists/* \
+    && apt-get clean
+
+# Copy virtual environment from builder
+COPY --from=builder /opt/venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
+
+# Create non-root user for security
+RUN groupadd -r translator && useradd -r -g translator translator
+
+# Create necessary directories
+RUN mkdir -p /app/uploads /app/outputs /app/logs /app/temp \
+    && chown -R translator:translator /app
+
+# Copy application code
+COPY --chown=translator:translator . .
+
+# Switch to non-root user
+USER translator
+
+# Environment variables
+ENV PYTHONUNBUFFERED=1 \
+    PYTHONDONTWRITEBYTECODE=1 \
+    PORT=8000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD curl -f http://localhost:${PORT}/health || exit 1
+
+# Expose port
+EXPOSE ${PORT}
+
+# Run with uvicorn
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "4"]

docker/frontend/Dockerfile

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+# Document Translation Frontend - Dockerfile
+# Multi-stage build for optimized production
+
+# Build stage
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Copy package files
+COPY frontend/package*.json ./
+
+# Install dependencies
+RUN npm ci --only=production=false
+
+# Copy source code
+COPY frontend/ .
+
+# Build arguments for environment
+ARG NEXT_PUBLIC_API_URL=http://localhost:8000
+ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
+
+# Build the application
+RUN npm run build
+
+# Production stage
+FROM node:20-alpine AS production
+
+WORKDIR /app
+
+# Create non-root user
+RUN addgroup -g 1001 -S nodejs && \
+    adduser -S nextjs -u 1001
+
+# Copy built assets from builder
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+
+# Set correct permissions
+RUN chown -R nextjs:nodejs /app
+
+USER nextjs
+
+# Environment
+ENV NODE_ENV=production \
+    PORT=3000 \
+    HOSTNAME="0.0.0.0"
+
+EXPOSE 3000
+
+CMD ["node", "server.js"]

docker/nginx/conf.d/default.conf

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+# Document Translation API - Main Server Block
+# HTTP to HTTPS redirect and main application routing
+
+# HTTP server - redirect to HTTPS
+server {
+    listen 80;
+    listen [::]:80;
+    server_name _;
+
+    # Allow health checks on HTTP
+    location /health {
+        proxy_pass http://backend/health;
+        proxy_http_version 1.1;
+        proxy_set_header Connection "";
+    }
+
+    # ACME challenge for Let's Encrypt
+    location /.well-known/acme-challenge/ {
+        root /var/www/certbot;
+    }
+
+    # Redirect all other traffic to HTTPS
+    location / {
+        return 301 https://$host$request_uri;
+    }
+}
+
+# HTTPS server - main application
+server {
+    listen 443 ssl http2;
+    listen [::]:443 ssl http2;
+    server_name _;
+
+    # SSL certificates (replace with your paths)
+    ssl_certificate /etc/nginx/ssl/fullchain.pem;
+    ssl_certificate_key /etc/nginx/ssl/privkey.pem;
+    ssl_trusted_certificate /etc/nginx/ssl/chain.pem;
+
+    # SSL configuration
+    ssl_session_timeout 1d;
+    ssl_session_cache shared:SSL:50m;
+    ssl_session_tickets off;
+
+    # Modern SSL configuration
+    ssl_protocols TLSv1.2 TLSv1.3;
+    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
+    ssl_prefer_server_ciphers off;
+
+    # OCSP Stapling
+    ssl_stapling on;
+    ssl_stapling_verify on;
+    resolver 8.8.8.8 8.8.4.4 valid=300s;
+    resolver_timeout 5s;
+
+    # Security headers
+    add_header X-Frame-Options "SAMEORIGIN" always;
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header X-XSS-Protection "1; mode=block" always;
+    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
+    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; font-src 'self' data:; connect-src 'self' ws: wss:;" always;
+
+    # API routes - proxy to backend
+    location /api/ {
+        rewrite ^/api/(.*)$ /$1 break;
+        
+        limit_req zone=api_limit burst=20 nodelay;
+        limit_conn conn_limit 10;
+
+        proxy_pass http://backend;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header Connection "";
+        
+        # CORS headers for API
+        add_header Access-Control-Allow-Origin $http_origin always;
+        add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS" always;
+        add_header Access-Control-Allow-Headers "Authorization, Content-Type, X-Requested-With" always;
+        add_header Access-Control-Allow-Credentials "true" always;
+
+        if ($request_method = 'OPTIONS') {
+            return 204;
+        }
+    }
+
+    # File upload endpoint - special handling
+    location /translate {
+        limit_req zone=upload_limit burst=5 nodelay;
+        limit_conn conn_limit 5;
+
+        proxy_pass http://backend/translate;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        
+        # Increased timeouts for file processing
+        proxy_connect_timeout 60s;
+        proxy_send_timeout 600s;
+        proxy_read_timeout 600s;
+    }
+
+    # Health check endpoint
+    location /health {
+        proxy_pass http://backend/health;
+        proxy_http_version 1.1;
+        proxy_set_header Connection "";
+    }
+
+    # Admin endpoints
+    location /admin {
+        limit_req zone=api_limit burst=10 nodelay;
+        
+        proxy_pass http://backend/admin;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    # Frontend - Next.js application
+    location / {
+        proxy_pass http://frontend;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+    }
+
+    # Static files caching
+    location /_next/static/ {
+        proxy_pass http://frontend;
+        proxy_cache_valid 200 365d;
+        add_header Cache-Control "public, max-age=31536000, immutable";
+    }
+
+    # Error pages
+    error_page 500 502 503 504 /50x.html;
+    location = /50x.html {
+        root /usr/share/nginx/html;
+    }
+}

docker/nginx/nginx.conf

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+# 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;
+}

docker/nginx/ssl/.gitkeep

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+# Self-signed SSL certificate placeholder
+# Replace with real certificates in production!
+
+# Generate self-signed certificate:
+# openssl req -x509 -nodes -days 365 -newkey rsa:2048 \
+#     -keyout privkey.pem \
+#     -out fullchain.pem \
+#     -subj "/CN=localhost"

docker/prometheus/prometheus.yml

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+# Prometheus Configuration for Document Translation API
+
+global:
+  scrape_interval: 15s
+  evaluation_interval: 15s
+  external_labels:
+    monitor: 'translate-api'
+
+alerting:
+  alertmanagers:
+    - static_configs:
+        - targets: []
+
+rule_files: []
+
+scrape_configs:
+  # Backend API metrics
+  - job_name: 'translate-backend'
+    static_configs:
+      - targets: ['backend:8000']
+    metrics_path: /metrics
+    scrape_interval: 10s
+
+  # Nginx metrics (requires nginx-prometheus-exporter)
+  - job_name: 'nginx'
+    static_configs:
+      - targets: ['nginx-exporter:9113']
+
+  # Node exporter for system metrics
+  - job_name: 'node'
+    static_configs:
+      - targets: ['node-exporter:9100']
+
+  # Docker metrics
+  - job_name: 'docker'
+    static_configs:
+      - targets: ['cadvisor:8080']