feat(observability): add phase9 health, readiness, metrics, request tracing, and simulator ops checks

Backend/index.ts

@@ -17,7 +17,9 @@ import streamsRoutes from './routes/streams';
 import recordingsRoutes from './routes/recordings';
 import pushNotificationsRoutes from './routes/push-notifications';
 import auditRoutes from './routes/audit';
+import opsRoutes from './routes/ops';
 import { rateLimit } from './middleware/security';
+import { requestContext } from './middleware/observability';
 import { setupRealtimeGateway } from './realtime/gateway';
 import { ensureMinioBucket } from './utils/minio';
 import { startRecordingsWorker } from './workers/recordings';
@@ -49,6 +51,7 @@ app.use(
   }),
 );
 app.use(rateLimit({ keyPrefix: 'global', windowMs: 60_000, max: 400 }));
+app.use(requestContext);
 app.use(express.json());
 app.use('/sim', express.static('public'));
 app.use('/videos', videosRoutes);
@@ -61,6 +64,7 @@ app.use('/streams', rateLimit({ keyPrefix: 'streams', windowMs: 60_000, max: 120
 app.use('/recordings', rateLimit({ keyPrefix: 'recordings', windowMs: 60_000, max: 120 }), recordingsRoutes);
 app.use('/push-notifications', pushNotificationsRoutes);
 app.use('/audit', auditRoutes);
+app.use('/ops', opsRoutes);
 
 app.use((err: unknown, _req: express.Request, res: express.Response, _next: express.NextFunction) => {
   console.error(err);