feat(ai-character): 관리자 API Phase 1 기반을 추가한다

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

@@ -142,6 +142,15 @@ interface ChatCharacterRepository : JpaRepository<ChatCharacter, Long> {
     )
     fun findByIdInWithTagMappings(@Param("ids") ids: List<Long>): List<ChatCharacter>
 
+    @Query(
+        """
+        SELECT c FROM ChatCharacter c
+        LEFT JOIN FETCH c.creatorMember
+        WHERE c.id = :id
+        """
+    )
+    fun findByIdWithCreatorMember(@Param("id") id: Long): ChatCharacter?
+
     fun findByCreatorMemberId(creatorMemberId: Long): ChatCharacter?
     fun existsByCreatorMemberId(creatorMemberId: Long): Boolean
 }