feat(recommend): 홈 장르 추천 크리에이터 중복 보충을 개선한다

src/main/kotlin/kr/co/vividnext/sodalive/v2/recommend/application/HomeRecommendationQueryService.kt

@@ -116,14 +116,38 @@ class HomeRecommendationQueryService(
         creatorLimit: Int = DEFAULT_GENRE_CREATOR_CREATOR_LIMIT
     ): List<HomeGenreCreatorRecommendationGroup> {
         val selectedCreatorIds = mutableSetOf<Long>()
-        val candidateLimit = genreLimit * creatorLimit
+        val partialFallbackGroups = mutableListOf<HomeGenreCreatorRecommendationGroup>()
+        val selectedGroups = mutableListOf<HomeGenreCreatorRecommendationGroup>()
 
-        return queryPort.findGenreCreatorRecommendations(memberId, includeAdultGenres, genreLimit, candidateLimit)
-            .map { group ->
-                group.copy(creators = group.creators.filter { selectedCreatorIds.add(it.creatorId) }.take(creatorLimit))
+        queryPort.findGenreCreatorRecommendations(memberId, includeAdultGenres, genreLimit, creatorLimit)
+            .forEach { group ->
+                if (selectedGroups.size >= genreLimit) return@forEach
+
+                val creators = group.creators.filter { it.creatorId !in selectedCreatorIds }.take(creatorLimit)
+                if (creators.isEmpty()) return@forEach
+
+                val deduplicatedGroup = group.copy(creators = creators)
+                if (group.isViewedTheme || creators.size == creatorLimit) {
+                    selectedGroups.add(deduplicatedGroup)
+                    selectedCreatorIds.addAll(creators.map { it.creatorId })
+                } else {
+                    partialFallbackGroups.add(group)
+                }
             }
-            .filter { it.creators.isNotEmpty() }
-            .take(genreLimit)
+
+        if (selectedGroups.size < genreLimit) {
+            partialFallbackGroups.forEach { group ->
+                if (selectedGroups.size >= genreLimit) return@forEach
+
+                val creators = group.creators.filter { it.creatorId !in selectedCreatorIds }.take(creatorLimit)
+                if (creators.isEmpty()) return@forEach
+
+                selectedGroups.add(group.copy(creators = creators))
+                selectedCreatorIds.addAll(creators.map { it.creatorId })
+            }
+        }
+
+        return selectedGroups.take(genreLimit)
     }
 
     fun resolveAudioContentActivityType(theme: String): RecommendedActivityType {