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/victoria-logs-cluster/0.1.5/Chart.yaml

@@ -0,0 +1,45 @@
+annotations:
+  artifacthub.io/category: monitoring-logging
+  artifacthub.io/changes: |
+    - render Vector dashboard only if subchart is enabled. See [#2896](https://github.com/VictoriaMetrics/helm-charts/issues/2896).
+  artifacthub.io/license: Apache-2.0
+  artifacthub.io/links: |
+    - name: Sources
+      url: https://github.com/VictoriaMetrics/helm-charts/tree/master/charts/victoria-logs-cluster
+    - name: Charts repo
+      url: https://victoriametrics.github.io/helm-charts/
+    - name: Docs
+      url: https://docs.victoriametrics.com/victorialogs/cluster/
+    - name: Changelog
+      url: https://docs.victoriametrics.com/victorialogs/changelog/
+  artifacthub.io/readme: |
+    # VictoriaLogs Cluster Helm chart
+
+    Chart documentation is available [here](https://docs.victoriametrics.com/helm/victoria-logs-cluster/).
+    Changelog is [here](https://docs.victoriametrics.com/helm/victoria-logs-cluster/changelog/).
+apiVersion: v2
+appVersion: v1.50.0
+dependencies:
+- condition: vector.enabled
+  name: vector
+  repository: https://helm.vector.dev
+  version: 0.52.*
+- name: victoria-metrics-common
+  repository: oci://ghcr.io/victoriametrics/helm-charts
+  version: 0.3.*
+description: The VictoriaLogs cluster Helm chart deploys VictoriaLogs cluster database
+  in Kubernetes.
+home: https://github.com/VictoriaMetrics/helm-charts
+icon: https://avatars.githubusercontent.com/u/43720803?s=200&v=4
+keywords:
+- victorialogs
+- logs
+- kubernetes
+- observability
+- logsql
+kubeVersion: '>=1.25.0-0'
+name: victoria-logs-cluster
+sources:
+- https://github.com/VictoriaMetrics/helm-charts
+type: application
+version: 0.1.5