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/chat/character/ChatCharacter.kt

@@ -54,7 +54,7 @@ class ChatCharacter(
     // 캐릭터 유형
     @Enumerated(EnumType.STRING)
     @Column(nullable = false)
-    var characterType: CharacterType = CharacterType.CHARACTER,
+    var characterType: CharacterType = CharacterType.Character,
 
     var isActive: Boolean = true
 ) : BaseEntity() {
@@ -134,6 +134,6 @@ class ChatCharacter(
 }
 
 enum class CharacterType {
-    CLONE,
-    CHARACTER
+    Clone,
+    Character
 }

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

@@ -225,7 +225,7 @@ class ChatCharacterService(
         appearance: String? = null,
         originalTitle: String? = null,
         originalLink: String? = null,
-        characterType: CharacterType = CharacterType.CHARACTER,
+        characterType: CharacterType = CharacterType.Character,
         tags: List<String> = emptyList(),
         values: List<String> = emptyList(),
         hobbies: List<String> = emptyList(),
@@ -309,7 +309,7 @@ class ChatCharacterService(
         appearance: String? = null,
         originalTitle: String? = null,
         originalLink: String? = null,
-        characterType: CharacterType = CharacterType.CHARACTER,
+        characterType: CharacterType = CharacterType.Character,
         tags: List<String> = emptyList(),
         values: List<String> = emptyList(),
         hobbies: List<String> = emptyList(),