feat: implement product service

services/product-service/Dockerfile

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+FROM node:18-alpine AS builder
+
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci --only=production
+
+FROM node:18-alpine
+
+RUN addgroup -g 1001 -S nodejs
+RUN adduser -S nodejs -u 1001
+
+WORKDIR /app
+COPY --from=builder --chown=nodejs:nodejs /app/node_modules ./node_modules
+COPY --chown=nodejs:nodejs . .
+
+USER nodejs
+EXPOSE 4000
+
+CMD ["node", "index.js"]

services/product-service/index.js

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+const express = require('express');
+const cors = require('cors');
+const helmet = require('helmet');
+
+const app = express();
+const port = process.env.PORT || 4000;
+
+app.use(helmet());
+app.use(cors());
+app.use(express.json());
+
+// Mock products database
+const products = [
+  { id: 1, name: 'Laptop Pro', price: 1299.99, category: 'Electronics', stock: 50 },
+  { id: 2, name: 'Wireless Headphones', price: 199.99, category: 'Electronics', stock: 100 },
+  { id: 3, name: 'Coffee Maker', price: 89.99, category: 'Home', stock: 25 },
+  { id: 4, name: 'Running Shoes', price: 129.99, category: 'Sports', stock: 75 }
+];
+
+app.get('/health', (req, res) => {
+  res.json({ 
+    status: 'healthy', 
+    service: 'product-service',
+    timestamp: new Date().toISOString(),
+    version: process.env.APP_VERSION || '1.0.0'
+  });
+});
+
+app.get('/products', (req, res) => {
+  const { category, limit } = req.query;
+  let filteredProducts = products;
+
+  if (category) {
+    filteredProducts = products.filter(p => 
+      p.category.toLowerCase() === category.toLowerCase()
+    );
+  }
+
+  if (limit) {
+    filteredProducts = filteredProducts.slice(0, parseInt(limit));
+  }
+
+  res.json({
+    products: filteredProducts,
+    total: filteredProducts.length
+  });
+});
+
+app.get('/products/:id', (req, res) => {
+  const product = products.find(p => p.id === parseInt(req.params.id));
+  if (!product) {
+    return res.status(404).json({ error: 'Product not found' });
+  }
+  res.json(product);
+});
+
+app.listen(port, () => {
+  console.log(`Product service running on port ${port}`);
+});