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/verticalpodautoscaler.yaml

@@ -0,0 +1,40 @@
+{{- if and (.Capabilities.APIVersions.Has "autoscaling.k8s.io/v1") (.Values.verticalPodAutoscaler.enabled) }}
+apiVersion: autoscaling.k8s.io/v1
+kind: VerticalPodAutoscaler
+metadata:
+  name: {{ include "prometheus-node-exporter.fullname" . }}
+  namespace: {{ include "prometheus-node-exporter.namespace" . }}
+  labels:
+    {{- include "prometheus-node-exporter.labels" . | nindent 4 }}
+spec:
+  {{- with .Values.verticalPodAutoscaler.recommenders }}
+  recommenders:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  resourcePolicy:
+    containerPolicies:
+    - containerName: node-exporter
+      {{- with .Values.verticalPodAutoscaler.controlledResources }}
+      controlledResources:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.verticalPodAutoscaler.controlledValues }}
+      controlledValues: {{ . }}
+      {{- end }}
+      {{- with .Values.verticalPodAutoscaler.maxAllowed }}
+      maxAllowed:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.verticalPodAutoscaler.minAllowed }}
+      minAllowed:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+  targetRef:
+    apiVersion: apps/v1
+    kind: DaemonSet
+    name: {{ include "prometheus-node-exporter.fullname" . }}
+  {{- with .Values.verticalPodAutoscaler.updatePolicy }}
+  updatePolicy:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+{{- end }}