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/alertmanager/1.37.0/templates/servicemonitor.yaml

@@ -0,0 +1,51 @@
+{{- if .Values.serviceMonitor.enabled }}
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ include "alertmanager.fullname" . }}
+  namespace: {{ default (include "alertmanager.namespace" .) .Values.serviceMonitor.namespace }}
+  labels:
+    {{- include "alertmanager.labels" . | nindent 4 }}
+    {{- with .Values.serviceMonitor.additionalLabels }}
+    {{- toYaml . | nindent 4 }}
+    {{- end }}
+spec:
+  endpoints:
+    - port: http
+      path: {{ .Values.serviceMonitor.path }}
+      honorLabels: {{ .Values.serviceMonitor.honorLabels }}
+      {{- with .Values.serviceMonitor.interval }}
+      interval: {{ . }}
+      {{- end }}
+      {{- with .Values.serviceMonitor.scrapeTimeout }}
+      scrapeTimeout: {{ . }}
+      {{- end }}
+      {{- with .Values.serviceMonitor.scheme }}
+      scheme: {{ . }}
+      {{- end }}
+      {{- with .Values.serviceMonitor.tlsConfig }}
+      tlsConfig:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.serviceMonitor.bearerTokenFile }}
+      bearerTokenFile: {{ . }}
+      {{- end }}
+      {{- with .Values.serviceMonitor.basicAuth }}
+      basicAuth:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.serviceMonitor.metricRelabelings }}
+      metricRelabelings:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.serviceMonitor.relabelings }}
+      relabelings:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+  namespaceSelector:
+    matchNames:
+      - {{ include "alertmanager.namespace" . }}
+  selector:
+    matchLabels:
+      {{- include "alertmanager.selectorLabels" . | nindent 6 }}
+{{- end }}