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

cnpg/argocd.yaml

@@ -0,0 +1,47 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: cnpg
+  namespace: argocd
+  finalizers:
+    - resources-finalizer.argocd.argoproj.io
+spec:
+  project: default
+
+  sources:
+    # Helm chart from CloudNativePG repository
+    - repoURL: https://cloudnative-pg.github.io/charts
+      chart: cloudnative-pg
+      targetRevision: 0.23.0
+      helm:
+        valueFiles:
+          - $values/cnpg/helm-values/cnpg.yaml
+    # Values file from Git repository
+    - repoURL: https://gitea0213.kro.kr/bluemayne/cluster-infrastructure.git
+      targetRevision: main
+      ref: values
+
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: cnpg-system
+
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+      allowEmpty: false
+
+    syncOptions:
+      - CreateNamespace=true
+      - PrunePropagationPolicy=foreground
+      - PruneLast=true
+      - ServerSideApply=true
+
+    retry:
+      limit: 5
+      backoff:
+        duration: 5s
+        factor: 2
+        maxDuration: 3m
+
+  revisionHistoryLimit: 10