feat(member): AI 캐릭터 회원 종류를 추가한다

src/main/kotlin/kr/co/vividnext/sodalive/member/Member.kt

@@ -39,6 +39,9 @@ data class Member(
     @Enumerated(value = EnumType.STRING)
     var role: MemberRole = MemberRole.USER,
 
+    @Enumerated(value = EnumType.STRING)
+    var memberKind: MemberKind = MemberKind.HUMAN,
+
     @Column(nullable = true)
     var activePid: String? = null,
 
@@ -180,6 +183,10 @@ enum class MemberRole {
     ADMIN, BOT, USER, CREATOR, AGENT, CONTENT_MANAGER
 }
 
+enum class MemberKind {
+    HUMAN, AI_CHARACTER
+}
+
 enum class MemberProvider {
     EMAIL, KAKAO, GOOGLE, APPLE, LINE
 }