fix(explorer): 미래 라이브 포함으로 음수 D+ 노출을 방지한다

src/main/kotlin/kr/co/vividnext/sodalive/explorer/ExplorerQueryRepository.kt

@@ -572,6 +572,8 @@ class ExplorerQueryRepository(
             .where(
                 liveRoom.member.id.eq(creatorId)
                     .and(liveRoom.channelName.isNotNull)
+                    .and(liveRoom.beginDateTime.isNotNull)
+                    .and(liveRoom.beginDateTime.loe(LocalDateTime.now()))
             )
             .fetchFirst()
     }

src/main/kotlin/kr/co/vividnext/sodalive/explorer/ExplorerService.kt

@@ -225,8 +225,9 @@ class ExplorerService(
         ).minOrNull()
 
         val debutDate = debutDateTime?.toLocalDate()
-        val dDay = if (debutDate != null) {
-            "D+${ChronoUnit.DAYS.between(debutDate, LocalDate.now())}"
+        val elapsedDebutDays = debutDate?.let { ChronoUnit.DAYS.between(it, LocalDate.now()) }
+        val dDay = if (elapsedDebutDays != null && elapsedDebutDays >= 0) {
+            "D+$elapsedDebutDays"
         } else {
             ""
         }