Add observability stack: ServiceMonitors, Tempo, OTel API instrumentation, dashboards

- Add ServiceMonitors for Traefik, ArgoCD, and Longhorn
- Enable cert-manager ServiceMonitor via helm values
- Deploy Grafana Tempo for distributed tracing (single-binary, Longhorn PVC)
- Add Tempo datasource with trace-to-logs and trace-to-metrics correlation
- Instrument API with OpenTelemetry SDK (Prometheus metrics + OTLP traces)
- Replace console.log with pino structured logging + pino-http middleware
- Add Grafana dashboards for Traefik, API overview, and PostgreSQL (CNPG)

apps/api/package.json

@@ -10,13 +10,22 @@
     "test": "echo \"no tests yet\""
   },
   "dependencies": {
+    "@opentelemetry/auto-instrumentations-node": "^0.71.0",
+    "@opentelemetry/exporter-prometheus": "^0.213.0",
+    "@opentelemetry/exporter-trace-otlp-http": "^0.213.0",
+    "@opentelemetry/resources": "^2.6.0",
+    "@opentelemetry/sdk-node": "^0.213.0",
+    "@opentelemetry/semantic-conventions": "^1.40.0",
+    "cors": "^2.8.5",
     "express": "^4.21.0",
-    "cors": "^2.8.5"
+    "pino": "^10.3.1",
+    "pino-http": "^11.0.0"
   },
   "devDependencies": {
-    "@types/express": "^5.0.0",
     "@types/cors": "^2.8.17",
+    "@types/express": "^5.0.0",
     "@types/node": "^22.10.0",
+    "@types/pino-http": "^6.1.0",
     "tsup": "^8.3.0",
     "tsx": "^4.19.0",
     "typescript": "^5.7.0"