Add VictoriaMetrics observability stack + sync catalog for monitoring test

- VM stack 10 charts: victoria-metrics-cluster/auth, victoria-logs-cluster,
  victoria-metrics-agent/alert, opentelemetry-collector, kube-state-metrics,
  prometheus-node-exporter, alertmanager, perses (JWT/OIDC, Infisical-ready)
- ArgoCD ApplicationSet (syncWave) + per-chart dip-values overlays
- doc/victoria-metrics-architecture.md, define-chart-resources updates
- includes pending working-tree changes (mlflow, kubeflow, apisix, CLAUDE.md)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

manifests/helm/prometheus-node-exporter/4.55.0/templates/clusterrolebinding.yaml

@@ -0,0 +1,20 @@
+{{- if and (eq .Values.rbac.create true) (eq .Values.kubeRBACProxy.enabled true) -}}
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  labels:
+    {{- include "prometheus-node-exporter.labels" . | nindent 4 }}
+  name: {{ template "prometheus-node-exporter.fullname" . }}
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+{{- if .Values.rbac.useExistingRole }}
+  name: {{ .Values.rbac.useExistingRole }}
+{{- else }}
+  name: {{ template "prometheus-node-exporter.fullname" . }}
+{{- end }}
+subjects:
+- kind: ServiceAccount
+  name: {{ template "prometheus-node-exporter.serviceAccountName" . }}
+  namespace: {{ template "prometheus-node-exporter.namespace" . }}
+{{- end -}}