REFACTOR(repo): restructure infra folder structure

- Remove argocd/, helm-values/, ingress/ subdirectories
- Move files to parent directory with standardized names
- Add namespace.yaml to all apps with Goldilocks labels
- Preserve vault/ subdirectories (falco, velero)
- Update main kustomization.yaml to reference argocd.yaml files directly
- Comment out argocd.yaml in each app's kustomization.yaml to prevent
  circular reference

Applications restructured:
- cert-manager (2 ArgoCD apps)
- external-secrets
- reloader
- vault (2 ArgoCD apps)
- velero (2 ArgoCD apps)
- falco
- cnpg
- haproxy
- metallb
- vpa
- argocd

external-secrets/helm-values.yaml

@@ -0,0 +1,40 @@
+# External Secrets Operator Helm Values
+# Chart: https://github.com/external-secrets/external-secrets
+
+# 리소스 제한
+resources:
+  requests:
+    cpu: 5m  # Reduced from 20m based on actual usage (1m)
+    memory: 64Mi
+  limits:
+    # cpu: removed to prevent throttling
+    memory: 256Mi
+
+# Webhook 설정
+webhook:
+  resources:
+    requests:
+      cpu: 2m  # Reduced from 10m based on actual usage (1m)
+      memory: 32Mi
+    limits:
+      # cpu: removed to prevent throttling
+      memory: 128Mi
+
+# CertController 설정
+certController:
+  resources:
+    requests:
+      cpu: 2m  # Reduced from 10m based on actual usage (1m)
+      memory: 32Mi
+    limits:
+      # cpu: removed to prevent throttling
+      memory: 128Mi
+
+# 동시 실행 제한
+concurrent: 3
+
+# 로그 레벨
+logLevel: info
+
+# CRD 자동 설치
+installCRDs: true