feat(worker): complete production-ready worker service implementation

This commit delivers the complete, production-ready worker service that was identified as missing from the audit. The implementation includes:

## Core Components Implemented:

### 1. Background Job Queue System ✅
- Progress tracking with Redis and WebSocket broadcasting
- Intelligent retry handler with exponential backoff strategies
- Automated cleanup service with scheduled maintenance
- Queue-specific retry policies and failure handling

### 2. Security Integration ✅
- Complete ClamAV virus scanning service with real-time threats detection
- File validation and quarantine system
- Security incident logging and user flagging
- Comprehensive threat signature management

### 3. Database Integration ✅
- Prisma-based database service with connection pooling
- Image status tracking and batch management
- Security incident recording and user flagging
- Health checks and statistics collection

### 4. Monitoring & Observability ✅
- Prometheus metrics collection for all operations
- Custom business metrics and performance tracking
- Comprehensive health check endpoints (ready/live/detailed)
- Resource usage monitoring and alerting

### 5. Production Docker Configuration ✅
- Multi-stage Docker build with Alpine Linux
- ClamAV daemon integration and configuration
- Security-hardened container with non-root user
- Health checks and proper signal handling
- Complete docker-compose setup with Redis, MinIO, Prometheus, Grafana

### 6. Configuration & Environment ✅
- Comprehensive environment validation with Joi
- Redis integration for progress tracking and caching
- Rate limiting and throttling configuration
- Logging configuration with Winston and file rotation

## Technical Specifications Met:

✅ **Real AI Integration**: OpenAI GPT-4 Vision + Google Cloud Vision with fallbacks
✅ **Image Processing Pipeline**: Sharp integration with EXIF preservation
✅ **Storage Integration**: MinIO/S3 with temporary file management
✅ **Queue Processing**: BullMQ with Redis, retry logic, and progress tracking
✅ **Security Features**: ClamAV virus scanning with quarantine system
✅ **Monitoring**: Prometheus metrics, health checks, structured logging
✅ **Production Ready**: Docker, Kubernetes compatibility, environment validation

## Integration Points:
- Connects with existing API queue system
- Uses shared database models and authentication
- Integrates with infrastructure components
- Provides real-time progress updates via WebSocket

This resolves the critical gap identified in the audit and provides a complete, production-ready worker service capable of processing images with real AI vision analysis at scale.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

packages/worker/docker-compose.yml

@@ -0,0 +1,177 @@
+version: '3.8'
+
+services:
+  worker:
+    build: .
+    container_name: seo-worker
+    restart: unless-stopped
+    environment:
+      - NODE_ENV=production
+      - WORKER_PORT=3002
+      - HEALTH_CHECK_PORT=8080
+      
+      # Redis Configuration
+      - REDIS_HOST=redis
+      - REDIS_PORT=6379
+      - REDIS_PASSWORD=${REDIS_PASSWORD}
+      - REDIS_DB=0
+      
+      # Database Configuration
+      - DATABASE_URL=${DATABASE_URL}
+      
+      # AI Vision APIs
+      - OPENAI_API_KEY=${OPENAI_API_KEY}
+      - GOOGLE_CLOUD_VISION_KEY=${GOOGLE_CLOUD_VISION_KEY}
+      - VISION_CONFIDENCE_THRESHOLD=0.40
+      
+      # Storage Configuration
+      - MINIO_ENDPOINT=minio
+      - MINIO_PORT=9000
+      - MINIO_USE_SSL=false
+      - MINIO_ACCESS_KEY=${MINIO_ACCESS_KEY}
+      - MINIO_SECRET_KEY=${MINIO_SECRET_KEY}
+      - MINIO_BUCKET_NAME=seo-images
+      
+      # Processing Configuration
+      - MAX_CONCURRENT_JOBS=5
+      - JOB_TIMEOUT=300000
+      - RETRY_ATTEMPTS=3
+      - RETRY_DELAY=2000
+      
+      # File Processing
+      - MAX_FILE_SIZE=52428800
+      - ALLOWED_FILE_TYPES=jpg,jpeg,png,gif,webp
+      - TEMP_DIR=/tmp/seo-worker
+      - TEMP_FILE_CLEANUP_INTERVAL=3600000
+      
+      # Virus Scanning
+      - VIRUS_SCAN_ENABLED=true
+      - CLAMAV_HOST=localhost
+      - CLAMAV_PORT=3310
+      - CLAMAV_TIMEOUT=30000
+      
+      # Monitoring
+      - METRICS_ENABLED=true
+      - METRICS_PORT=9090
+      - LOG_LEVEL=info
+      
+    ports:
+      - "3002:3002"  # Worker API port
+      - "8080:8080"  # Health check port
+      - "9090:9090"  # Metrics port
+    
+    volumes:
+      - worker-temp:/tmp/seo-worker
+      - worker-logs:/app/logs
+    
+    depends_on:
+      - redis
+      - minio
+    
+    networks:
+      - worker-network
+    
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8080/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 30s
+
+  redis:
+    image: redis:7-alpine
+    container_name: seo-redis
+    restart: unless-stopped
+    command: redis-server --appendonly yes --requirepass ${REDIS_PASSWORD}
+    environment:
+      - REDIS_PASSWORD=${REDIS_PASSWORD}
+    ports:
+      - "6379:6379"
+    volumes:
+      - redis-data:/data
+    networks:
+      - worker-network
+    healthcheck:
+      test: ["CMD", "redis-cli", "-a", "${REDIS_PASSWORD}", "ping"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  minio:
+    image: minio/minio:latest
+    container_name: seo-minio
+    restart: unless-stopped
+    command: server /data --console-address ":9001"
+    environment:
+      - MINIO_ROOT_USER=${MINIO_ACCESS_KEY}
+      - MINIO_ROOT_PASSWORD=${MINIO_SECRET_KEY}
+    ports:
+      - "9000:9000"  # MinIO API
+      - "9001:9001"  # MinIO Console
+    volumes:
+      - minio-data:/data
+    networks:
+      - worker-network
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  # Optional: Prometheus for metrics collection
+  prometheus:
+    image: prom/prometheus:latest
+    container_name: seo-prometheus
+    restart: unless-stopped
+    command:
+      - '--config.file=/etc/prometheus/prometheus.yml'
+      - '--storage.tsdb.path=/prometheus'
+      - '--web.console.libraries=/etc/prometheus/console_libraries'
+      - '--web.console.templates=/etc/prometheus/consoles'
+      - '--storage.tsdb.retention.time=200h'
+      - '--web.enable-lifecycle'
+    ports:
+      - "9091:9090"
+    volumes:
+      - ./prometheus.yml:/etc/prometheus/prometheus.yml:ro
+      - prometheus-data:/prometheus
+    networks:
+      - worker-network
+    depends_on:
+      - worker
+
+  # Optional: Grafana for metrics visualization
+  grafana:
+    image: grafana/grafana:latest
+    container_name: seo-grafana
+    restart: unless-stopped
+    environment:
+      - GF_SECURITY_ADMIN_USER=admin
+      - GF_SECURITY_ADMIN_PASSWORD=${GRAFANA_PASSWORD:-admin}
+      - GF_USERS_ALLOW_SIGN_UP=false
+    ports:
+      - "3000:3000"
+    volumes:
+      - grafana-data:/var/lib/grafana
+    networks:
+      - worker-network
+    depends_on:
+      - prometheus
+
+volumes:
+  worker-temp:
+    driver: local
+  worker-logs:
+    driver: local
+  redis-data:
+    driver: local
+  minio-data:
+    driver: local
+  prometheus-data:
+    driver: local
+  grafana-data:
+    driver: local
+
+networks:
+  worker-network:
+    driver: bridge