fix(osiv): lazy 관계 선로딩을 보완한다

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

@@ -74,6 +74,28 @@ interface ChatCharacterRepository : JpaRepository<ChatCharacter, Long> {
         pageable: Pageable
     ): List<ChatCharacter>
 
+    /**
+     * 특정 캐릭터와 태그를 공유하는 다른 캐릭터 ID를 무작위로 조회 (현재 캐릭터 제외)
+     */
+    @Query(
+        """
+        SELECT c.id FROM ChatCharacter c
+        JOIN c.tagMappings tm
+        JOIN tm.tag t
+        WHERE c.isActive = true
+          AND c.id <> :characterId
+          AND t.id IN (
+            SELECT t2.id FROM ChatCharacterTagMapping tm2 JOIN tm2.tag t2 WHERE tm2.chatCharacter.id = :characterId
+          )
+        GROUP BY c.id
+        ORDER BY function('RAND')
+        """
+    )
+    fun findRandomIdsBySharedTags(
+        @Param("characterId") characterId: Long,
+        pageable: Pageable
+    ): List<Long>
+
     /**
      * 활성 캐릭터 무작위 조회
      */
@@ -99,6 +121,27 @@ interface ChatCharacterRepository : JpaRepository<ChatCharacter, Long> {
     fun findRandomActiveExcluding(@Param("excludeIds") excludeIds: List<Long>, pageable: Pageable): List<ChatCharacter>
 
     fun findByIdInAndIsActiveTrue(ids: List<Long>): List<ChatCharacter>
+
+    @Query(
+        """
+        SELECT DISTINCT c FROM ChatCharacter c
+        LEFT JOIN FETCH c.tagMappings tm
+        LEFT JOIN FETCH tm.tag
+        WHERE c.id = :id
+        """
+    )
+    fun findByIdWithTagMappings(@Param("id") id: Long): ChatCharacter?
+
+    @Query(
+        """
+        SELECT DISTINCT c FROM ChatCharacter c
+        LEFT JOIN FETCH c.tagMappings tm
+        LEFT JOIN FETCH tm.tag
+        WHERE c.id IN :ids
+        """
+    )
+    fun findByIdInWithTagMappings(@Param("ids") ids: List<Long>): List<ChatCharacter>
+
     fun findByCreatorMemberId(creatorMemberId: Long): ChatCharacter?
     fun existsByCreatorMemberId(creatorMemberId: Long): Boolean
 }

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

@@ -210,13 +210,15 @@ class ChatCharacterService(
      */
     @Transactional(readOnly = true)
     fun getOtherCharactersBySharedTags(characterId: Long, limit: Int = 10): List<ChatCharacter> {
-        val others = chatCharacterRepository.findRandomBySharedTags(
+        val ids = chatCharacterRepository.findRandomIdsBySharedTags(
             characterId,
             PageRequest.of(0, limit)
-        )
-        // 태그 초기화 (지연 로딩 문제 방지)
-        others.forEach { it.tagMappings.size }
-        return others
+        ).distinct()
+        if (ids.isEmpty()) return emptyList()
+
+        val charactersById = chatCharacterRepository.findByIdInWithTagMappings(ids)
+            .associateBy { it.id }
+        return ids.mapNotNull { charactersById[it] }
     }
 
     /**
@@ -555,13 +557,12 @@ class ChatCharacterService(
      */
     @Transactional(readOnly = true)
     fun getCharacterDetail(id: Long): ChatCharacter? {
-        val character = findById(id) ?: return null
+        val character = chatCharacterRepository.findByIdWithTagMappings(id) ?: return null
 
         // 지연 로딩된 관계 데이터 초기화
-        character.tagMappings.size
-        character.valueMappings.size
-        character.hobbyMappings.size
-        character.goalMappings.size
+        character.valueMappings.forEach { it.value.value }
+        character.hobbyMappings.forEach { it.hobby.hobby }
+        character.goalMappings.forEach { it.goal.goal }
         character.memories.size
         character.personalities.size
         character.backgrounds.size

src/main/kotlin/kr/co/vividnext/sodalive/chat/original/service/OriginalWorkQueryService.kt

@@ -43,8 +43,13 @@ class OriginalWorkQueryService(
      */
     @Transactional(readOnly = true)
     fun getOriginalWork(id: Long): OriginalWork {
-        return originalWorkRepository.findByIdAndIsDeletedFalse(id)
+        val originalWork = originalWorkRepository.findByIdAndIsDeletedFalse(id)
             .orElseThrow { SodaException(messageKey = "chat.original.not_found") }
+
+        originalWork.originalLinks.forEach { it.url }
+        originalWork.tagMappings.forEach { it.tag.tag }
+
+        return originalWork
     }
 
     /**