feat(chat-character): 원작/원작 링크/캐릭터 유형 추가 및 외부 API 호출 분리

- ChatCharacter 엔티티에 originalTitle, originalLink(Nullable), characterType(Enum) 필드 추가
  - characterType: CLONE | CHARACTER (기본값 CHARACTER)
  - 원작/원작 링크는 빈 문자열 대신 null 허용으로 저장
- Admin DTO(Register/Update)에 originalTitle, originalLink, characterType 필드 추가
- 등록 API에서 외부 API 요청 바디에 3개 필드(originalTitle, originalLink, characterType) 제외 처리
- 수정 API에서 3개 필드만 변경된 경우 외부 API 호출 생략하고 DB만 업데이트
  - hasChanges: 외부 API 대상 필드 변경 여부 판단(3개 필드 제외)
  - hasDbOnlyChanges: 3개 필드만 변경된 경우 처리 분기
- Service 계층에 필드 매핑 및 Enum 파싱 추가
  - createChatCharacter / createChatCharacterWithDetails에 originalTitle/originalLink/characterType 반영
- 이름 중복 검증 로직 유지, isActive=false 비활성화 이름 처리 로직 유지

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

@@ -4,6 +4,8 @@ import kr.co.vividnext.sodalive.common.BaseEntity
 import javax.persistence.CascadeType
 import javax.persistence.Column
 import javax.persistence.Entity
+import javax.persistence.EnumType
+import javax.persistence.Enumerated
 import javax.persistence.FetchType
 import javax.persistence.OneToMany
 
@@ -41,6 +43,19 @@ class ChatCharacter(
     @Column(columnDefinition = "TEXT")
     var appearance: String? = null,
 
+    // 원작 (optional)
+    @Column(nullable = true)
+    var originalTitle: String? = null,
+
+    // 원작 링크 (optional)
+    @Column(nullable = true)
+    var originalLink: String? = null,
+
+    // 캐릭터 유형
+    @Enumerated(EnumType.STRING)
+    @Column(nullable = false)
+    var characterType: CharacterType = CharacterType.CHARACTER,
+
     var isActive: Boolean = true
 ) : BaseEntity() {
     var imagePath: String? = null
@@ -117,3 +132,8 @@ class ChatCharacter(
         relationships.add(relationship)
     }
 }
+
+enum class CharacterType {
+    CLONE,
+    CHARACTER
+}

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

@@ -1,6 +1,7 @@
 package kr.co.vividnext.sodalive.chat.character.service
 
 import kr.co.vividnext.sodalive.admin.chat.character.dto.ChatCharacterUpdateRequest
+import kr.co.vividnext.sodalive.chat.character.CharacterType
 import kr.co.vividnext.sodalive.chat.character.ChatCharacter
 import kr.co.vividnext.sodalive.chat.character.ChatCharacterGoal
 import kr.co.vividnext.sodalive.chat.character.ChatCharacterHobby
@@ -208,6 +209,9 @@ class ChatCharacterService(
         speechPattern: String? = null,
         speechStyle: String? = null,
         appearance: String? = null,
+        originalTitle: String? = null,
+        originalLink: String? = null,
+        characterType: CharacterType = CharacterType.CHARACTER,
         tags: List<String> = emptyList(),
         values: List<String> = emptyList(),
         hobbies: List<String> = emptyList(),
@@ -223,7 +227,10 @@ class ChatCharacterService(
             mbti = mbti,
             speechPattern = speechPattern,
             speechStyle = speechStyle,
-            appearance = appearance
+            appearance = appearance,
+            originalTitle = originalTitle,
+            originalLink = originalLink,
+            characterType = characterType
         )
 
         // 관련 엔티티 연결
@@ -286,6 +293,9 @@ class ChatCharacterService(
         speechPattern: String? = null,
         speechStyle: String? = null,
         appearance: String? = null,
+        originalTitle: String? = null,
+        originalLink: String? = null,
+        characterType: CharacterType = CharacterType.CHARACTER,
         tags: List<String> = emptyList(),
         values: List<String> = emptyList(),
         hobbies: List<String> = emptyList(),
@@ -296,8 +306,23 @@ class ChatCharacterService(
         relationships: List<Pair<String, String>> = emptyList()
     ): ChatCharacter {
         val chatCharacter = createChatCharacter(
-            characterUUID, name, description, systemPrompt, age, gender, mbti,
-            speechPattern, speechStyle, appearance, tags, values, hobbies, goals
+            characterUUID = characterUUID,
+            name = name,
+            description = description,
+            systemPrompt = systemPrompt,
+            age = age,
+            gender = gender,
+            mbti = mbti,
+            speechPattern = speechPattern,
+            speechStyle = speechStyle,
+            appearance = appearance,
+            originalTitle = originalTitle,
+            originalLink = originalLink,
+            characterType = characterType,
+            tags = tags,
+            values = values,
+            hobbies = hobbies,
+            goals = goals
         )
 
         // 추가 정보 설정
@@ -365,6 +390,11 @@ class ChatCharacterService(
         request.speechPattern?.let { chatCharacter.speechPattern = it }
         request.speechStyle?.let { chatCharacter.speechStyle = it }
         request.appearance?.let { chatCharacter.appearance = it }
+        request.originalTitle?.let { chatCharacter.originalTitle = it }
+        request.originalLink?.let { chatCharacter.originalLink = it }
+        request.characterType?.let {
+            runCatching { CharacterType.valueOf(it) }.getOrNull()?.let { ct -> chatCharacter.characterType = ct }
+        }
 
         // request에서 변경된 데이터만 업데이트
         if (request.tags != null) {