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/perses/0.21.0/templates/gateway.yaml

@@ -0,0 +1,42 @@
+{{- if and .Values.gateway.enabled .Values.gateway.createGateway }}
+{{- $fullName := include "perses.fullname" . -}}
+{{- $gatewayName := default (printf "%s-gateway" $fullName) .Values.gateway.name -}}
+apiVersion: gateway.networking.k8s.io/v1
+kind: Gateway
+metadata:
+  name: {{ $gatewayName }}
+  {{- if .Values.gateway.namespace }}
+  namespace: {{ .Values.gateway.namespace }}
+  {{- end }}
+  labels:
+    {{- include "perses.labels" . | nindent 4 }}
+    app.kubernetes.io/component: networking
+    {{- with .Values.gateway.labels }}
+    {{- toYaml . | nindent 4 }}
+    {{- end }}
+  {{- with .Values.gateway.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+spec:
+  gatewayClassName: {{ required "gateway.gatewayClassName is required when creating a Gateway" .Values.gateway.gatewayClassName }}
+  {{- if .Values.gateway.listeners }}
+  listeners:
+    {{- range .Values.gateway.listeners }}
+    - name: {{ .name }}
+      port: {{ .port }}
+      protocol: {{ .protocol }}
+      {{- if .hostname }}
+      hostname: {{ .hostname | quote }}
+      {{- end }}
+      {{- if .tls }}
+      tls:
+        {{- toYaml .tls | nindent 8 }}
+      {{- end }}
+      {{- if .allowedRoutes }}
+      allowedRoutes:
+        {{- toYaml .allowedRoutes | nindent 8 }}
+      {{- end }}
+    {{- end }}
+  {{- end }}
+{{- end }}