refactor: chat 도메인 경로 수정

src/main/java/usay/app/domain/chat/repository/ChatRepository.java

@@ -1,6 +1,6 @@
 package usay.app.domain.chat.repository;
 
 import org.springframework.data.jpa.repository.JpaRepository;
-import usay.app.common.domain.Chat;
+import usay.app.domain.chat.entity.Chat;
 
 public interface ChatRepository extends JpaRepository<Chat, Long> {}