improvements: ApplicationSet ignoreDifferences(SS VCT) + vmauth drop unauthorized_user

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

manifests/applicationset/victoria-metrics/1.0.0/applicationset.yaml

@@ -93,6 +93,13 @@ spec:
       destination:
         server: https://kubernetes.default.svc
         namespace: monitoring
+      # StatefulSet volumeClaimTemplates는 immutable + K8s가 volumeMode 등 기본값을 자동 주입 →
+      # 영구 OutOfSync 방지(vmstorage/vlstorage). VCT 변경은 어차피 적용 불가라 무시.
+      ignoreDifferences:
+        - group: apps
+          kind: StatefulSet
+          jsonPointers:
+            - /spec/volumeClaimTemplates
       syncPolicy:
         automated:
           prune: true

manifests/applicationset/victoria-metrics/1.0.0/vmauth-values.yaml

@@ -16,5 +16,4 @@ config:
           headers:
             - "AccountID: {{.LogsAccountID}}"
             - "ProjectID: 0"
-  unauthorized_user:
-    url_prefix: "http://vmcluster-victoria-metrics-cluster-vmselect.monitoring.svc.cluster.local:8481/select/0/prometheus"
+  # unauthorized_user 미설정: 미인증 요청은 401(account 0 무인증 접근 차단).