feat: Add complete Docker containerization for v4

Production & Development Setup:
- Multi-stage Dockerfile with optimized build (node:20-alpine)
- docker-compose.yml for production with PostgreSQL
- docker-compose.dev.yml for development with hot reload
- Dockerfile.dev for development environment
- .dockerignore to reduce build context

Features:
- Health checks for both app and database
- Non-root user security (nextjs:nodejs)
- Resource limits (CPU/memory)
- Volume persistence for logs and database
- PostgreSQL 16 with automatic initialization
- Network isolation with custom bridge network

Helper Scripts:
- docker-build.sh - Build production image
- docker-start.sh - Start all services
- docker-stop.sh - Stop containers safely
- docker-logs.sh - View real-time logs

Documentation:
- DOCKER.md - Complete deployment guide with:
  * Quick start commands
  * Production deployment steps
  * Development hot reload setup
  * Configuration examples
  * Docker commands reference
  * Troubleshooting guide
  * Best practices for security & performance

Configuration:
- Environment-based configuration via .env
- Safe defaults for testing ($50 positions)
- Separate dev/prod compose files
- Debug mode with Node.js inspector (port 9229)
- Log rotation and resource monitoring

Ready for deployment with:
  cd v4 && ./docker-start.sh

v4/docker-build.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+# Trading Bot v4 - Docker Build Script
+# Builds production-ready Docker image
+
+set -e
+
+echo "🐳 Building Trading Bot v4 Docker Image..."
+echo ""
+
+# Navigate to v4 directory
+cd "$(dirname "$0")"
+
+# Check if .env exists
+if [ ! -f ".env" ]; then
+    echo "⚠️  Warning: .env file not found!"
+    echo "   Creating from .env.example..."
+    cp .env.example .env
+    echo "   ✅ .env created. Please edit it with your credentials."
+    echo ""
+fi
+
+# Build with BuildKit for better performance
+export DOCKER_BUILDKIT=1
+
+echo "📦 Building image with BuildKit..."
+docker-compose build --progress=plain
+
+echo ""
+echo "✅ Build complete!"
+echo ""
+echo "Next steps:"
+echo "  1. Edit .env file with your credentials"
+echo "  2. Run: docker-compose up -d"
+echo "  3. Check logs: docker-compose logs -f"
+echo ""