[feat] 로그인한 사용자가 도시 보관했는지 여부 응답 DTO 추가

related to: #127

src/main/java/com/haejwo/tripcometrue/domain/store/dto/response/CheckCityStoredResponseDto.java

@@ -0,0 +1,12 @@
+package com.haejwo.tripcometrue.domain.store.dto.response;
+
+import lombok.Builder;
+
+public record CheckCityStoredResponseDto(
+    boolean isStored
+) {
+
+    @Builder
+    public CheckCityStoredResponseDto {
+    }
+}