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

Backend/routes/ops.ts

@@ -0,0 +1,44 @@
+import { Router } from 'express';
+
+import { db } from '../db/client';
+import { mediaProvider } from '../media/service';
+import { getAllMetrics } from '../observability/metrics';
+import { minioBucket, minioClient } from '../utils/minio';
+
+const router = Router();
+
+router.get('/live', (_req, res) => {
+  res.json({ status: 'ok', service: 'backend', timestamp: new Date().toISOString() });
+});
+
+router.get('/ready', async (_req, res) => {
+  try {
+    await db.execute('select 1');
+    await minioClient.bucketExists(minioBucket);
+
+    res.json({
+      status: 'ready',
+      checks: {
+        database: 'ok',
+        minio: 'ok',
+        mediaProvider: mediaProvider.name,
+      },
+      timestamp: new Date().toISOString(),
+    });
+  } catch (error) {
+    res.status(503).json({
+      status: 'not_ready',
+      error: error instanceof Error ? error.message : 'unknown error',
+      timestamp: new Date().toISOString(),
+    });
+  }
+});
+
+router.get('/metrics', (_req, res) => {
+  res.json({
+    timestamp: new Date().toISOString(),
+    metrics: getAllMetrics(),
+  });
+});
+
+export default router;