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/Chart.yaml

@@ -0,0 +1,29 @@
+annotations:
+  artifacthub.io/license: Apache-2.0
+  artifacthub.io/links: |
+    - name: Chart Source
+      url: https://github.com/prometheus-community/helm-charts
+apiVersion: v2
+appVersion: 1.11.1
+description: A Helm chart for prometheus node-exporter
+home: https://github.com/prometheus/node_exporter/
+icon: https://raw.githubusercontent.com/cncf/artwork/refs/heads/main/projects/prometheus/icon/color/prometheus-icon-color.svg
+keywords:
+- node-exporter
+- prometheus
+- exporter
+maintainers:
+- email: gianrubio@gmail.com
+  name: gianrubio
+  url: https://github.com/gianrubio
+- email: zanhsieh@gmail.com
+  name: zanhsieh
+  url: https://github.com/zanhsieh
+- email: rootsandtrees@posteo.de
+  name: zeritti
+  url: https://github.com/zeritti
+name: prometheus-node-exporter
+sources:
+- https://github.com/prometheus/node_exporter/
+type: application
+version: 4.55.0