fix(content): 콘텐츠 리스트 조회 API

- 로그인 된 사용자만 사용할 수 있도록 수정

src/main/kotlin/kr/co/vividnext/sodalive/content/AudioContentController.kt

@@ -246,6 +246,8 @@ class AudioContentController(private val service: AudioContentService) {
         @AuthenticationPrincipal(expression = "#this == 'anonymousUser' ? null : member") member: Member?,
         pageable: Pageable
     ) = run {
+        if (member == null) throw SodaException("로그인 정보를 확인해주세요.")
+
         ApiResponse.ok(
             service.getLatestContentByTheme(
                 theme = emptyList(),
@@ -253,11 +255,7 @@ class AudioContentController(private val service: AudioContentService) {
                 offset = pageable.offset,
                 limit = pageable.pageSize.toLong(),
                 isFree = isFree ?: false,
-                isAdult = if (member != null) {
-                    (isAdultContentVisible ?: true) && member.auth != null
-                } else {
-                    false
-                },
+                isAdult = (isAdultContentVisible ?: true) && member.auth != null,
                 isPointAvailableOnly = isPointAvailableOnly ?: false
             )
         )