📝 docs(prd): update user management enhancement epic status

- mark all Definition of Done items as completed in epic-002-user-management-enhancement.md
- update story 002.001 status from "Ready for Done" to "Done"

docs/prd/epic-002-user-management-enhancement.md

@@ -36,11 +36,11 @@
 - **回滚计划**: 保留旧版界面作为备份，可快速切换
 
 ## Definition of Done
-- [ ] 所有故事完成且验收标准满足
-- [ ] 现有功能通过测试验证
-- [ ] 集成点正常工作
-- [ ] 文档相应更新
-- [ ] 现有功能无回归
+- [x] 所有故事完成且验收标准满足
+- [x] 现有功能通过测试验证
+- [x] 集成点正常工作
+- [x] 文档相应更新
+- [x] 现有功能无回归
 
 ---
 

docs/stories/002.001.story.md

@@ -3,7 +3,7 @@
 **父史诗**: docs/prd/epic-002-user-management-enhancement.md
 
 ## Status
-Ready for Done
+Done
 
 ## Story
 **As a** 系统管理员