[Refactor] 할인 알림 기능 리펙토링

[kangcheolung]

📌 Description

할인 알림 기능 리펙토링

✅ To-do

• 할인 알림 기능 리펙토링

📒 기타

[marshmallowing]

Branch feature/170 created!

[coderabbitai]

🔗 Related PRs

#165 - fix: 할인 알림 설정 방식을 직접 가격 입력에서 할인율 선택으로 변경 [merged]

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