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/templates/service-monitor.yaml

@@ -0,0 +1,44 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+{{- if .Values.metrics.serviceMonitor.enabled }}
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ .Values.metrics.serviceMonitor.name | default (include "apisix.fullname" .) }}
+  namespace: {{ .Values.metrics.serviceMonitor.namespace | default .Release.Namespace }}
+  labels:
+    {{- include "apisix.labels" . | nindent 4 }}
+    {{- if .Values.metrics.serviceMonitor.labels }}
+    {{- toYaml .Values.metrics.serviceMonitor.labels | nindent 4 }}
+    {{- end }}
+  {{- if .Values.metrics.serviceMonitor.annotations }}
+  annotations: {{- toYaml .Values.metrics.serviceMonitor.annotations | nindent 4 }}
+  {{- end }}
+spec:
+  namespaceSelector:
+    matchNames:
+    - {{ .Values.metrics.serviceMonitor.namespace | default .Release.Namespace }}
+  selector:
+    matchLabels:
+      {{- include "apisix.labels" . | nindent 6 }}
+      app.kubernetes.io/service: apisix-prometheus-metrics
+  endpoints:
+  - scheme: http
+    targetPort: prometheus
+    path: {{ .Values.apisix.prometheus.path }}
+    interval: {{ .Values.metrics.serviceMonitor.interval }}
+{{- end }}