fix: 라이브 메인 API

- redis caching이 적용된 data class에 @JsonProperty 애노테이션 추가

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

@@ -9,5 +9,5 @@ data class AudioContentMainItem @QueryProjection constructor(
     @JsonProperty("title") val title: String,
     @JsonProperty("coverImageUrl") val coverImageUrl: String,
     @JsonProperty("creatorNickname") val creatorNickname: String,
-    @JsonProperty("isPointAvailable") val isPointAvailable: Boolean
+    @get:JsonProperty("isPointAvailable") val isPointAvailable: Boolean
 )