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/Chart.yaml

@@ -0,0 +1,15 @@
+apiVersion: v2
+appVersion: 0.152.0
+description: OpenTelemetry Collector Helm chart for Kubernetes
+home: https://opentelemetry.io/
+icon: https://opentelemetry.io/img/logos/opentelemetry-logo-nav.png
+maintainers:
+- name: dmitryax
+- name: jaronoff97
+- name: TylerHelmuth
+name: opentelemetry-collector
+sources:
+- https://github.com/open-telemetry/opentelemetry-collector
+- https://github.com/open-telemetry/opentelemetry-collector-contrib
+type: application
+version: 0.156.2