Kustomize 설정 최적화 - 불필요한 레이블 제거

- Base kustomization에서 commonLabels 제거
- DEV overlay에서 labels 설정 제거
- 파일 끝 줄바꿈 정리

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

deployment/cicd/kustomize/base/kustomization.yaml

@@ -42,10 +42,6 @@ resources:
   - kos-mock/service.yaml
   - kos-mock/cm-kos-mock.yaml
 
-commonLabels:
-  app: phonebill
-  version: v1
-
 images:
   - name: acrdigitalgarage01.azurecr.io/phonebill/api-gateway
     newTag: latest

deployment/cicd/kustomize/overlays/dev/kustomization.yaml

@@ -63,8 +63,3 @@ images:
     newTag: dev-latest
   - name: acrdigitalgarage01.azurecr.io/phonebill/kos-mock
     newTag: dev-latest
-
-labels:
-  - includeSelectors: true
-    pairs:
-      environment: dev