쿠폰 리스트 가져오기 API 수정

AS-IS: 캔 타입 String
TO-BE: 캔 타입 Int

src/main/kotlin/kr/co/vividnext/sodalive/can/coupon/CanCouponService.kt

@@ -30,7 +30,7 @@ class CanCouponService(
                 GetCouponListItemResponse(
                     id = it.id!!,
                     couponName = it.couponName,
-                    can = "${it.can}캔",
+                    can = it.can,
                     couponCount = it.couponCount,
                     useCouponCount = useCouponCount,
                     validity = it.validity.format(DateTimeFormatter.ofPattern("yyyy-MM-dd")),

src/main/kotlin/kr/co/vividnext/sodalive/can/coupon/GetCouponListResponse.kt

@@ -8,7 +8,7 @@ data class GetCouponListResponse(
 data class GetCouponListItemResponse(
     val id: Long,
     val couponName: String,
-    val can: String,
+    val can: Int,
     val couponCount: Int,
     val useCouponCount: Int,
     val validity: String,