feat(original): 원작별 캐릭터 조회 API 추가

src/main/kotlin/kr/co/vividnext/sodalive/admin/chat/original/AdminOriginalWorkController.kt

@@ -2,11 +2,14 @@ package kr.co.vividnext.sodalive.admin.chat.original
 
 import com.amazonaws.services.s3.model.ObjectMetadata
 import com.fasterxml.jackson.databind.ObjectMapper
+import kr.co.vividnext.sodalive.admin.chat.character.dto.ChatCharacterSearchListPageResponse
+import kr.co.vividnext.sodalive.admin.chat.character.dto.ChatCharacterSearchResponse
 import kr.co.vividnext.sodalive.admin.chat.original.dto.OriginalWorkAssignCharactersRequest
 import kr.co.vividnext.sodalive.admin.chat.original.dto.OriginalWorkPageResponse
 import kr.co.vividnext.sodalive.admin.chat.original.dto.OriginalWorkRegisterRequest
 import kr.co.vividnext.sodalive.admin.chat.original.dto.OriginalWorkResponse
 import kr.co.vividnext.sodalive.admin.chat.original.dto.OriginalWorkUpdateRequest
+import kr.co.vividnext.sodalive.admin.chat.original.service.AdminOriginalWorkService
 import kr.co.vividnext.sodalive.aws.s3.S3Uploader
 import kr.co.vividnext.sodalive.common.ApiResponse
 import kr.co.vividnext.sodalive.common.SodaException
@@ -34,7 +37,7 @@ import org.springframework.web.multipart.MultipartFile
 @RequestMapping("/admin/chat/original")
 @PreAuthorize("hasRole('ADMIN')")
 class AdminOriginalWorkController(
-    private val originalWorkService: kr.co.vividnext.sodalive.admin.chat.original.service.AdminOriginalWorkService,
+    private val originalWorkService: AdminOriginalWorkService,
     private val s3Uploader: S3Uploader,
     @Value("\${cloud.aws.s3.bucket}")
     private val s3Bucket: String,
@@ -157,6 +160,27 @@ class AdminOriginalWorkController(
         ApiResponse.ok(null)
     }
 
+    /**
+     * 관리자용: 지정 원작에 속한 캐릭터 목록 페이징 조회
+     * - 활성 캐릭터만 포함
+     * - 응답 항목: 캐릭터 이미지(URL), 이름
+     */
+    @GetMapping("/{id}/characters")
+    fun listCharactersOfOriginal(
+        @PathVariable id: Long,
+        @RequestParam(defaultValue = "0") page: Int,
+        @RequestParam(defaultValue = "20") size: Int
+    ) = run {
+        val pageRes = originalWorkService.getCharactersOfOriginalWorkPage(id, page, size)
+        val content = pageRes.content.map { ChatCharacterSearchResponse.from(it, imageHost) }
+        ApiResponse.ok(
+            ChatCharacterSearchListPageResponse(
+                totalCount = pageRes.totalElements,
+                content = content
+            )
+        )
+    }
+
     /** 이미지 업로드 공통 처리 */
     private fun uploadImage(originalWorkId: Long, image: MultipartFile): String {
         try {

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

@@ -2,6 +2,7 @@ package kr.co.vividnext.sodalive.admin.chat.original.service
 
 import kr.co.vividnext.sodalive.admin.chat.original.dto.OriginalWorkRegisterRequest
 import kr.co.vividnext.sodalive.admin.chat.original.dto.OriginalWorkUpdateRequest
+import kr.co.vividnext.sodalive.chat.character.ChatCharacter
 import kr.co.vividnext.sodalive.chat.character.repository.ChatCharacterRepository
 import kr.co.vividnext.sodalive.chat.original.OriginalWork
 import kr.co.vividnext.sodalive.chat.original.OriginalWorkRepository
@@ -85,10 +86,33 @@ class AdminOriginalWorkService(
     /** 원작 페이징 조회 */
     @Transactional(readOnly = true)
     fun getOriginalWorkPage(page: Int, size: Int): Page<OriginalWork> {
-        val pageable = PageRequest.of(page, size, Sort.by("createdAt").descending())
+        val safePage = if (page < 0) 0 else page
+        val safeSize = when {
+            size <= 0 -> 20
+            size > 100 -> 100
+            else -> size
+        }
+        val pageable = PageRequest.of(safePage, safeSize, Sort.by("createdAt").descending())
         return originalWorkRepository.findByIsDeletedFalse(pageable)
     }
 
+    /** 지정 원작에 속한 활성 캐릭터 페이징 조회 (최신순) */
+    @Transactional(readOnly = true)
+    fun getCharactersOfOriginalWorkPage(originalWorkId: Long, page: Int, size: Int): Page<ChatCharacter> {
+        // 원작 존재 및 소프트 삭제 여부 확인
+        originalWorkRepository.findByIdAndIsDeletedFalse(originalWorkId)
+            .orElseThrow { SodaException("해당 원작을 찾을 수 없습니다") }
+
+        val safePage = if (page < 0) 0 else page
+        val safeSize = when {
+            size <= 0 -> 20
+            size > 100 -> 100
+            else -> size
+        }
+        val pageable = PageRequest.of(safePage, safeSize, Sort.by("createdAt").descending())
+        return chatCharacterRepository.findByOriginalWorkIdAndIsActiveTrue(originalWorkId, pageable)
+    }
+
     /** 원작 검색 (제목/콘텐츠타입/카테고리, 소프트 삭제 제외) - 무페이징 */
     @Transactional(readOnly = true)
     fun searchOriginalWorksAll(searchTerm: String): List<OriginalWork> {

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

@@ -13,6 +13,7 @@ interface ChatCharacterRepository : JpaRepository<ChatCharacter, Long> {
     fun findByName(name: String): ChatCharacter?
     fun findByIsActiveTrue(pageable: Pageable): Page<ChatCharacter>
     fun findByOriginalWorkIdAndIsActiveTrueOrderByCreatedAtDesc(originalWorkId: Long): List<ChatCharacter>
+    fun findByOriginalWorkIdAndIsActiveTrue(originalWorkId: Long, pageable: Pageable): Page<ChatCharacter>
 
     /**
      * 2주 이내(파라미터 since 이상) 활성 캐릭터 페이징 조회