Step 1 migration: add API service and dedicated PostgreSQL

api/Dockerfile

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+FROM node:20-alpine
+
+WORKDIR /app
+COPY api/server.js ./server.js
+
+EXPOSE 3001
+CMD ["node", "server.js"]

api/server.js

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+const http = require("http");
+
+const port = Number(process.env.API_INTERNAL_PORT || 3001);
+const serviceName = process.env.SERVICE_NAME || "video-games-api";
+
+function sendJson(response, statusCode, payload) {
+  response.writeHead(statusCode, { "Content-Type": "application/json; charset=utf-8" });
+  response.end(JSON.stringify(payload));
+}
+
+const server = http.createServer((request, response) => {
+  const url = new URL(request.url || "/", `http://${request.headers.host || "localhost"}`);
+
+  if (request.method === "GET" && url.pathname === "/health") {
+    sendJson(response, 200, {
+      status: "ok",
+      service: serviceName,
+      timestamp: new Date().toISOString(),
+    });
+    return;
+  }
+
+  sendJson(response, 404, {
+    status: "not_found",
+    message: "Route not found",
+  });
+});
+
+server.listen(port, "0.0.0.0", () => {
+  // Keep startup logs minimal and readable in docker compose logs.
+  console.log(`${serviceName} listening on port ${port}`);
+});