[PRODUCT-122] [Feat] 닉네임, 전화번호 중복 확인 API 구현

[leegwichan]

🏷️ 상위 작업 (Ticket Number)

PRODUCT-8

🚀 구현 내용

• 닉네임 중복 확인 API 구현
• 전화번호 중복 확인 API 구현

📅 마감일

No response

[github-actions]

🎉 This issue has been resolved in version 1.4.0-develop.7 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀

[github-actions]

🎉 This issue has been resolved in version 1.4.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀