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/apisix/2.14.0/charts/etcd/Chart.yaml

@@ -0,0 +1,35 @@
+annotations:
+  category: Database
+  images: |
+    - name: etcd
+      image: docker.io/bitnami/etcd:3.6.4-debian-12-r3
+    - name: os-shell
+      image: docker.io/bitnami/os-shell:12-debian-12-r50
+  licenses: Apache-2.0
+  tanzuCategory: service
+apiVersion: v2
+appVersion: 3.6.4
+dependencies:
+- name: common
+  repository: oci://registry-1.docker.io/bitnamicharts
+  tags:
+  - bitnami-common
+  version: 2.x.x
+description: etcd is a distributed key-value store designed to securely store data
+  across a cluster. etcd is widely used in production on account of its reliability,
+  fault-tolerance and ease of use.
+home: https://bitnami.com
+icon: https://dyltqmyl993wv.cloudfront.net/assets/stacks/etcd/img/etcd-stack-220x234.png
+keywords:
+- etcd
+- cluster
+- database
+- cache
+- key-value
+maintainers:
+- name: Broadcom, Inc. All Rights Reserved.
+  url: https://github.com/bitnami/charts
+name: etcd
+sources:
+- https://github.com/bitnami/charts/tree/main/bitnami/etcd
+version: 12.0.18