feat(live-room): 라이브방 정보 응답에 무료 여부를 추가한다

src/main/kotlin/kr/co/vividnext/sodalive/live/room/LiveRoomService.kt

@@ -1076,6 +1076,7 @@ class LiveRoomService(
             donationRankingTop3UserIds = donationRankingTop3UserIds,
             menuPan = menuPan?.menu ?: "",
             creatorLanguageCode = creatorLanguageCode,
+            isFreeRoom = room.price == 0,
             isPrivateRoom = room.type == LiveRoomType.PRIVATE,
             password = room.password,
             isActiveRoulette = isActiveRoulette,

src/main/kotlin/kr/co/vividnext/sodalive/live/room/info/GetRoomInfoResponse.kt

@@ -23,6 +23,7 @@ data class GetRoomInfoResponse(
     val donationRankingTop3UserIds: List<Long>,
     val menuPan: String,
     val creatorLanguageCode: String?,
+    val isFreeRoom: Boolean,
     val isPrivateRoom: Boolean = false,
     val password: String? = null,
     val isActiveRoulette: Boolean = false,