feat(admin-character): 캐릭터 리스트, 캐릭터 상세

- CharacterType: 첫 글자만 대문자, 나머지 소문자로 변경
- 이미지가 null 이면 ""으로 변경

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

@@ -124,8 +124,8 @@ class AdminChatCharacterController(
             originalLink = request.originalLink,
             characterType = request.characterType?.let {
                 runCatching { CharacterType.valueOf(it) }
-                    .getOrDefault(CharacterType.CHARACTER)
-            } ?: CharacterType.CHARACTER,
+                    .getOrDefault(CharacterType.Character)
+            } ?: CharacterType.Character,
             tags = request.tags,
             values = request.values,
             hobbies = request.hobbies,

src/main/kotlin/kr/co/vividnext/sodalive/admin/chat/character/dto/ChatCharacterDetailResponse.kt

@@ -31,7 +31,7 @@ data class ChatCharacterDetailResponse(
             val fullImagePath = if (chatCharacter.imagePath != null && imageHost.isNotEmpty()) {
                 "$imageHost/${chatCharacter.imagePath}"
             } else {
-                chatCharacter.imagePath
+                chatCharacter.imagePath ?: ""
             }
 
             return ChatCharacterDetailResponse(