feat: Add Docker support with production and development configurations for backend and frontend

server/Dockerfile

@@ -0,0 +1,23 @@
+# Node.js backend
+FROM node:18-alpine
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci --only=production
+
+# Copy server code
+COPY server.js ./
+
+# Expose ports
+EXPOSE 3001 3002
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD node -e "require('http').get('http://localhost:3001/api/turtles', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"
+
+# Start server
+CMD ["node", "server.js"]