GitHub Actions workflow push 이벤트 비활성화

- push 트리거를 주석 처리하여 자동 실행 방지
- Pull Request 생성 시에만 자동 실행
- 수동 실행(workflow_dispatch)은 계속 가능

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

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

.github/workflows/backend-cicd.yaml

@@ -1,14 +1,14 @@
 name: Backend CI/CD Pipeline
 
 on:
-  push:
+  # push:
-    branches:
+  #   branches:
-      - develop
+  #     - develop
-      - main
+  #     - main
-    paths:
+  #   paths:
-      - '*-service/**'
+  #     - '*-service/**'
-      - '.github/workflows/backend-cicd.yaml'
+  #     - '.github/workflows/backend-cicd.yaml'
-      - '.github/kustomize/**'
+  #     - '.github/kustomize/**'
   pull_request:
     branches:
       - develop