feat: Add Docker containerization for consistent deployment

- Multi-stage Dockerfile with Node.js 20 Alpine base
- Production and development docker-compose configurations
- Health check API endpoint for container monitoring
- Build and deployment scripts with versioning support
- Port 3000 configuration for nginx compatibility
- Non-root user and security hardening
- Resource limits and logging configuration
- Package.json scripts for Docker operations

This eliminates dependency conflicts and provides reproducible deployments.

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

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

docker-compose.prod.yml

@@ -0,0 +1,58 @@
+version: '3.8'
+
+services:
+  bct-app:
+    image: bct-whitelabel:latest
+    ports:
+      - "3000:3000"
+    environment:
+      - NODE_ENV=production
+      - HOST=0.0.0.0
+      - PORT=3000
+      # Supabase
+      - PUBLIC_SUPABASE_URL=${PUBLIC_SUPABASE_URL}
+      - PUBLIC_SUPABASE_ANON_KEY=${PUBLIC_SUPABASE_ANON_KEY}
+      - SUPABASE_SERVICE_ROLE_KEY=${SUPABASE_SERVICE_ROLE_KEY}
+      # Stripe
+      - STRIPE_PUBLISHABLE_KEY=${STRIPE_PUBLISHABLE_KEY}
+      - STRIPE_SECRET_KEY=${STRIPE_SECRET_KEY}
+      - STRIPE_WEBHOOK_SECRET=${STRIPE_WEBHOOK_SECRET}
+      # Email
+      - RESEND_API_KEY=${RESEND_API_KEY}
+      # Monitoring
+      - SENTRY_DSN=${SENTRY_DSN}
+      - SENTRY_RELEASE=${SENTRY_RELEASE:-latest}
+    env_file:
+      - .env
+    volumes:
+      - ./logs:/app/logs
+      - /etc/localtime:/etc/localtime:ro
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "node", "-e", "const http=require('http');const options={hostname:'localhost',port:3000,path:'/api/health',timeout:2000};const req=http.request(options,(res)=>{process.exit(res.statusCode===200?0:1)});req.on('error',()=>{process.exit(1)});req.end();"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+      start_period: 60s
+    networks:
+      - bct-network
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "10m"
+        max-file: "3"
+    deploy:
+      resources:
+        limits:
+          memory: 1G
+          cpus: '1.0'
+        reservations:
+          memory: 512M
+          cpus: '0.5'
+
+networks:
+  bct-network:
+    driver: bridge
+    ipam:
+      config:
+        - subnet: 172.20.0.0/16