refactor(character): 최근 등록된 캐릭터 조회 로직 개선

조회할 때부터 isActive = true, limit 10개를 불러오도록 리팩토링
- ChatCharacterRepository에 findByIsActiveTrueOrderByCreatedAtDesc 메소드 추가
- ChatCharacterService의 getNewCharacters 메소드 수정

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/repository/ChatCharacterRepository.kt

@@ -14,6 +14,11 @@ interface ChatCharacterRepository : JpaRepository<ChatCharacter, Long> {
     fun findByName(name: String): ChatCharacter?
     fun findByIsActiveTrue(pageable: Pageable): Page<ChatCharacter>
 
+    /**
+     * 활성화된 캐릭터를 생성일 기준 내림차순으로 조회
+     */
+    fun findByIsActiveTrueOrderByCreatedAtDesc(pageable: Pageable): List<ChatCharacter>
+
     /**
      * 이름, 설명, MBTI, 태그로 캐릭터 검색
      */

src/main/kotlin/kr/co/vividnext/sodalive/chat/character/service/ChatCharacterService.kt

@@ -11,6 +11,7 @@ import kr.co.vividnext.sodalive.chat.character.repository.ChatCharacterHobbyRepo
 import kr.co.vividnext.sodalive.chat.character.repository.ChatCharacterRepository
 import kr.co.vividnext.sodalive.chat.character.repository.ChatCharacterTagRepository
 import kr.co.vividnext.sodalive.chat.character.repository.ChatCharacterValueRepository
+import org.springframework.data.domain.PageRequest
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
 
@@ -48,10 +49,7 @@ class ChatCharacterService(
      */
     @Transactional(readOnly = true)
     fun getNewCharacters(limit: Int = 10): List<ChatCharacter> {
-        return chatCharacterRepository.findAll()
-            .filter { it.isActive }
-            .sortedByDescending { it.createdAt }
-            .take(limit)
+        return chatCharacterRepository.findByIsActiveTrueOrderByCreatedAtDesc(PageRequest.of(0, limit))
     }
 
     /**