fix(channel-donation): 후원 조회 월 경계를 UTC 전달 기준으로 보정한다

src/main/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationService.kt

@@ -63,13 +63,23 @@ class ChannelDonationService(
         memberRepository.findCreatorByIdOrNull(creatorId)
             ?: throw SodaException(messageKey = "member.validation.creator_not_found")
 
+        val utcZoneId = ZoneId.of("UTC")
         val kstZoneId = ZoneId.of("Asia/Seoul")
-        val nowKst = ZonedDateTime.now(kstZoneId)
-        val startDateTime = nowKst
+        val nowUtc = ZonedDateTime.now(utcZoneId)
+        val nowKst = nowUtc.withZoneSameInstant(kstZoneId)
+
+        val startDateTimeKst = nowKst
             .with(TemporalAdjusters.firstDayOfMonth())
             .toLocalDate()
-            .atStartOfDay()
-        val endDateTime = startDateTime.plusMonths(1)
+            .atStartOfDay(kstZoneId)
+        val endDateTimeKst = startDateTimeKst.plusMonths(1)
+
+        val startDateTime = startDateTimeKst
+            .withZoneSameInstant(utcZoneId)
+            .toLocalDateTime()
+        val endDateTime = endDateTimeKst
+            .withZoneSameInstant(utcZoneId)
+            .toLocalDateTime()
         val isCreator = member.role == MemberRole.CREATOR && creatorId == member.id
 
         val totalCount = channelDonationMessageRepository.getChannelDonationMessageTotalCount(