[claude] API observability — structured logging + /api/metrics endpoint (#57) (#87)

artifacts/api-server/src/app.ts

@@ -4,6 +4,7 @@ import path from "path";
 import { fileURLToPath } from "url";
 import router from "./routes/index.js";
 import adminRelayPanelRouter from "./routes/admin-relay-panel.js";
+import { requestIdMiddleware } from "./middlewares/request-id.js";
 import { responseTimeMiddleware } from "./middlewares/response-time.js";
 
 const app: Express = express();
@@ -50,6 +51,7 @@ app.use(
 
 app.use(express.json());
 app.use(express.urlencoded({ extended: true }));
+app.use(requestIdMiddleware);
 app.use(responseTimeMiddleware);
 
 app.use("/api", router);