📝 docs(stories): add parent epic reference to admin interface test story

- 添加父史诗链接docs/prd/epic-001-test-infrastructure.md以明确故事归属关系

docs/stories/001.004.story.md

@@ -1,5 +1,7 @@
 # Story 001.004: Admin管理界面集成测试和E2E测试覆盖
 
+**父史诗**: docs/prd/epic-001-test-infrastructure.md
+
 ## Status
 Ready for Development