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/opentelemetry-collector/0.156.2/ci/clusterrole-values.yaml

@@ -0,0 +1,27 @@
+mode: daemonset
+
+image:
+  repository: "ghcr.io/open-telemetry/opentelemetry-collector-releases/opentelemetry-collector-k8s"
+
+command:
+  name: "otelcol-k8s"
+
+clusterRole:
+  create: true
+  name: "testing-clusterrole"
+  rules:
+    - apiGroups:
+      - ''
+      resources:
+      - 'pods'
+      - 'nodes'
+      verbs:
+      - 'get'
+      - 'list'
+      - 'watch'
+  clusterRoleBinding:
+    name: "testing-clusterrolebinding"
+resources:
+  limits:
+    cpu: 100m
+    memory: 200M