FEAT(code-server): add namespace field to code-ser

code-server/kustomization.yaml

@@ -1,6 +1,8 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 
+namespace: code-server
+
 resources:
   # ArgoCD Application 리소스는 infrastructure/kustomization.yaml에서 관리
   # - argocd/code-server.yaml