Add Docker support with comprehensive deployment options

- Add multi-stage Dockerfile with optimized builds for Go backend and Node.js frontend
- Create docker-entrypoint.sh script for managing both services with PM2
- Add .dockerignore for optimal build context
- Update README.md with Docker deployment documentation including:
  - Docker build and run instructions
  - Persistent data configuration with volume mounts
  - Complete environment variable reference table
  - Docker Compose example configuration

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

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

docker-entrypoint.sh

@@ -0,0 +1,122 @@
+#!/bin/sh
+
+# Docker entrypoint script for Claude Code Proxy
+# Starts both the Go proxy server and Remix frontend
+
+set -e
+
+echo "🚀 Starting Claude Code Proxy services..."
+echo "========================================="
+
+# Function to handle graceful shutdown
+cleanup() {
+    echo ""
+    echo "🛑 Shutting down services..."
+    pm2 delete all 2>/dev/null || true
+    exit 0
+}
+
+# Trap signals for graceful shutdown
+trap cleanup SIGTERM SIGINT
+
+# Create PM2 ecosystem file
+cat > /tmp/ecosystem.config.js << EOF
+module.exports = {
+  apps: [
+    {
+      name: 'proxy-server',
+      script: './bin/proxy',
+      cwd: '/app',
+      env: {
+        PORT: '${PORT}',
+        READ_TIMEOUT: '${READ_TIMEOUT}s',
+        WRITE_TIMEOUT: '${WRITE_TIMEOUT}s', 
+        IDLE_TIMEOUT: '${IDLE_TIMEOUT}s',
+        ANTHROPIC_FORWARD_URL: '${ANTHROPIC_FORWARD_URL}',
+        ANTHROPIC_VERSION: '${ANTHROPIC_VERSION}',
+        ANTHROPIC_MAX_RETRIES: '${ANTHROPIC_MAX_RETRIES}',
+        DB_PATH: '${DB_PATH}'
+      },
+      error_file: '/dev/stderr',
+      out_file: '/dev/stdout',
+      log_file: '/dev/stdout',
+      time: true
+    },
+    {
+      name: 'web-server',
+      script: 'npm',
+      args: 'start',
+      cwd: '/app/web',
+      env: {
+        PORT: '${WEB_PORT}',
+        NODE_ENV: 'production'
+      },
+      error_file: '/dev/stderr',
+      out_file: '/dev/stdout', 
+      log_file: '/dev/stdout',
+      time: true
+    }
+  ]
+};
+EOF
+
+echo "📊 Configuration:"
+echo "   - Proxy Server: http://localhost:${PORT}"
+echo "   - Web Dashboard: http://localhost:${WEB_PORT}"
+echo "   - Database: ${DB_PATH}"
+echo "   - Anthropic API: ${ANTHROPIC_FORWARD_URL}"
+echo "========================================="
+
+# Start services with PM2
+echo "🔄 Starting proxy server..."
+pm2 start /tmp/ecosystem.config.js --only proxy-server --no-daemon &
+
+# Wait for proxy to be ready
+echo "⏳ Waiting for proxy server to start..."
+timeout=30
+while [ $timeout -gt 0 ]; do
+    if wget --quiet --spider "http://localhost:${PORT}/health" 2>/dev/null; then
+        echo "✅ Proxy server is ready"
+        break
+    fi
+    sleep 1
+    timeout=$((timeout - 1))
+done
+
+if [ $timeout -eq 0 ]; then
+    echo "❌ Proxy server failed to start within 30 seconds"
+    exit 1
+fi
+
+echo "🔄 Starting web server..."
+pm2 start /tmp/ecosystem.config.js --only web-server --no-daemon &
+
+# Wait for web server to be ready
+echo "⏳ Waiting for web server to start..."
+timeout=30
+while [ $timeout -gt 0 ]; do
+    if wget --quiet --spider "http://localhost:${WEB_PORT}" 2>/dev/null; then
+        echo "✅ Web server is ready"
+        break
+    fi
+    sleep 1
+    timeout=$((timeout - 1))
+done
+
+if [ $timeout -eq 0 ]; then
+    echo "❌ Web server failed to start within 30 seconds"
+    exit 1
+fi
+
+echo ""
+echo "✨ All services started successfully!"
+echo "========================================="
+echo "📊 Web Dashboard: http://localhost:${WEB_PORT}"
+echo "🔌 API Proxy: http://localhost:${PORT}"
+echo "💚 Health Check: http://localhost:${PORT}/health"
+echo "========================================="
+echo "💡 To use with Claude Code, set: ANTHROPIC_BASE_URL=http://localhost:${PORT}"
+echo ""
+
+# Keep container running and show logs
+pm2 logs --raw