feat(content-ranking): 랭킹 스냅샷 제목 번역을 적용한다

src/main/kotlin/kr/co/vividnext/sodalive/v2/content/ranking/adapter/out/persistence/DefaultAudioRankingSnapshotPersistenceAdapter.kt

@@ -1,5 +1,6 @@
 package kr.co.vividnext.sodalive.v2.content.ranking.adapter.out.persistence
 
+import kr.co.vividnext.sodalive.content.translation.ContentTranslationRepository
 import kr.co.vividnext.sodalive.v2.content.ranking.domain.AudioRankingType
 import kr.co.vividnext.sodalive.v2.content.ranking.port.out.AudioRankingSnapshotPort
 import kr.co.vividnext.sodalive.v2.content.ranking.port.out.AudioRankingSnapshotRecord
@@ -9,25 +10,28 @@ import java.time.LocalDateTime
 
 @Repository
 class DefaultAudioRankingSnapshotPersistenceAdapter(
-    private val repository: AudioRankingSnapshotRepository
+    private val repository: AudioRankingSnapshotRepository,
+    private val contentTranslationRepository: ContentTranslationRepository
 ) : AudioRankingSnapshotPort {
     override fun findLatestVisibleSnapshots(
         rankingType: AudioRankingType,
-        nowUtc: LocalDateTime
+        nowUtc: LocalDateTime,
+        locale: String
     ): List<AudioRankingSnapshotRecord> {
-        return repository.findLatestVisibleSnapshots(rankingType.name, nowUtc).map { it.toRecord() }
+        return repository.findLatestVisibleSnapshots(rankingType.name, nowUtc).toRecords(locale)
     }
 
     override fun findPreviousVisibleSnapshots(
         rankingType: AudioRankingType,
         currentAggregationStartAtUtc: LocalDateTime,
-        nowUtc: LocalDateTime
+        nowUtc: LocalDateTime,
+        locale: String
     ): List<AudioRankingSnapshotRecord> {
         return repository.findPreviousVisibleSnapshots(
             rankingType = rankingType.name,
             currentAggregationStartAtUtc = currentAggregationStartAtUtc,
             nowUtc = nowUtc
-        ).map { it.toRecord() }
+        ).toRecords(locale)
     }
 
     @Transactional
@@ -46,14 +50,25 @@ class DefaultAudioRankingSnapshotPersistenceAdapter(
         repository.saveAll(newSnapshots.map { it.toEntity(visibleFromAtUtc) })
     }
 
-    private fun AudioRankingSnapshot.toRecord(): AudioRankingSnapshotRecord {
+    private fun List<AudioRankingSnapshot>.toRecords(locale: String): List<AudioRankingSnapshotRecord> {
+        if (isEmpty()) return emptyList()
+        val translatedTitleByContentId = contentTranslationRepository.findByContentIdInAndLocale(
+            map { it.contentId },
+            locale
+        ).mapNotNull { translation ->
+            translation.renderedPayload.title.takeIf { it.isNotBlank() }?.let { translation.contentId to it }
+        }.toMap()
+        return map { snapshot -> snapshot.toRecord(translatedTitleByContentId[snapshot.contentId] ?: snapshot.title) }
+    }
+
+    private fun AudioRankingSnapshot.toRecord(displayTitle: String = title): AudioRankingSnapshotRecord {
         return AudioRankingSnapshotRecord(
             rankingType = rankingType,
             aggregationStartAtUtc = aggregationStartAtUtc,
             aggregationEndAtUtc = aggregationEndAtUtc,
             visibleFromAtUtc = visibleFromAtUtc,
             contentId = contentId,
-            title = title,
+            title = displayTitle,
             creatorMemberId = creatorMemberId,
             creatorNickname = creatorNickname,
             coverImageUrl = coverImageUrl,