feat(content): 콘텐츠 전체보기 응답 모델을 추가한다

src/main/kotlin/kr/co/vividnext/sodalive/v2/api/content/overview/dto/ContentOverviewPageResponse.kt

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+package kr.co.vividnext.sodalive.v2.api.content.overview.dto
+
+import com.fasterxml.jackson.annotation.JsonProperty
+import kr.co.vividnext.sodalive.v2.content.recommendation.domain.AudioCard
+import kr.co.vividnext.sodalive.v2.recommendation.port.out.HomeFirstAudioContentRecord
+
+data class ContentOverviewPageResponse(
+    val type: ContentOverviewType,
+    val items: List<ContentOverviewItemResponse>,
+    val page: Int,
+    val size: Int,
+    @JsonProperty("hasNext")
+    val hasNext: Boolean
+)
+
+enum class ContentOverviewType {
+    NEW_AND_HOT_AUDIO,
+    FIRST_AUDIO_CONTENT;
+
+    companion object {
+        fun from(value: String?): ContentOverviewType {
+            return values().firstOrNull { it.name == value } ?: NEW_AND_HOT_AUDIO
+        }
+    }
+}
+
+data class ContentOverviewItemResponse(
+    val contentId: Long,
+    val title: String,
+    val coverImage: String?,
+    val price: Int,
+    @JsonProperty("isPointAvailable")
+    val isPointAvailable: Boolean,
+    val creatorNickname: String,
+    @JsonProperty("isAdult")
+    val isAdult: Boolean,
+    @JsonProperty("isFirstContent")
+    val isFirstContent: Boolean,
+    @JsonProperty("isOriginalSeries")
+    val isOriginalSeries: Boolean
+) {
+    companion object {
+        fun fromNewAndHot(audio: AudioCard): ContentOverviewItemResponse {
+            return ContentOverviewItemResponse(
+                contentId = audio.audioContentId,
+                title = audio.title,
+                coverImage = audio.imageUrl,
+                price = audio.price,
+                isPointAvailable = audio.isPointAvailable,
+                creatorNickname = audio.creatorNickname,
+                isAdult = audio.isAdult,
+                isFirstContent = audio.isFirstContent,
+                isOriginalSeries = audio.isOriginalSeries
+            )
+        }
+
+        fun fromFirstAudioContent(
+            audio: HomeFirstAudioContentRecord,
+            coverImage: String?,
+            isAdult: Boolean,
+            isOriginalSeries: Boolean
+        ): ContentOverviewItemResponse {
+            return ContentOverviewItemResponse(
+                contentId = audio.contentId,
+                title = audio.title,
+                coverImage = coverImage,
+                price = audio.price,
+                isPointAvailable = audio.isPointAvailable,
+                creatorNickname = audio.creatorNickname,
+                isAdult = isAdult,
+                isFirstContent = true,
+                isOriginalSeries = isOriginalSeries
+            )
+        }
+    }
+}

src/test/kotlin/kr/co/vividnext/sodalive/v2/api/content/overview/dto/ContentOverviewPageResponseTest.kt

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+package kr.co.vividnext.sodalive.v2.api.content.overview.dto
+
+import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
+import kr.co.vividnext.sodalive.v2.recommendation.port.out.HomeFirstAudioContentRecord
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+
+class ContentOverviewPageResponseTest {
+    private val objectMapper = jacksonObjectMapper()
+
+    @Test
+    @DisplayName("콘텐츠 전체보기 응답은 공개 JSON 필드명만 직렬화한다")
+    fun shouldSerializeContentOverviewPageResponse() {
+        val response = ContentOverviewPageResponse(
+            type = ContentOverviewType.NEW_AND_HOT_AUDIO,
+            items = listOf(
+                ContentOverviewItemResponse(
+                    contentId = 1L,
+                    title = "audio",
+                    coverImage = "https://cdn.test/audio.png",
+                    price = 10,
+                    isPointAvailable = true,
+                    creatorNickname = "creator",
+                    isAdult = false,
+                    isFirstContent = true,
+                    isOriginalSeries = false
+                )
+            ),
+            page = 0,
+            size = 20,
+            hasNext = true
+        )
+
+        val json = objectMapper.readTree(objectMapper.writeValueAsString(response))
+
+        assertEquals("NEW_AND_HOT_AUDIO", json["type"].asText())
+        assertEquals(true, json["hasNext"].asBoolean())
+        assertEquals(1L, json["items"][0]["contentId"].asLong())
+        assertEquals("https://cdn.test/audio.png", json["items"][0]["coverImage"].asText())
+        assertEquals(true, json["items"][0]["isPointAvailable"].asBoolean())
+        assertEquals(false, json["items"][0]["isAdult"].asBoolean())
+        assertEquals(true, json["items"][0]["isFirstContent"].asBoolean())
+        assertEquals(false, json["items"][0]["isOriginalSeries"].asBoolean())
+        assertEquals(false, json["items"][0].has("audioContentId"))
+        assertEquals(false, json["items"][0].has("imageUrl"))
+        assertEquals(false, json["items"][0].has("duration"))
+        assertEquals(false, json["items"][0].has("creatorId"))
+        assertEquals(false, json["items"][0].has("creatorProfileImage"))
+        assertEquals(false, json["items"][0].has("pointAvailable"))
+        assertEquals(false, json["items"][0].has("adult"))
+        assertEquals(false, json["items"][0].has("firstContent"))
+        assertEquals(false, json["items"][0].has("originalSeries"))
+    }
+
+    @Test
+    @DisplayName("첫 번째 오디오 콘텐츠 변환은 성인/오리지널 플래그를 전달한다")
+    fun shouldMapFirstAudioContentFlags() {
+        val response = ContentOverviewItemResponse.fromFirstAudioContent(
+            audio = HomeFirstAudioContentRecord(
+                contentId = 1L,
+                creatorId = 10L,
+                creatorNickname = "creator",
+                creatorProfileImage = null,
+                title = "first audio",
+                price = 100,
+                coverImage = "cover/audio.png",
+                isPointAvailable = true
+            ),
+            coverImage = "https://cdn.test/cover/audio.png",
+            isAdult = true,
+            isOriginalSeries = true
+        )
+
+        assertEquals(true, response.isAdult)
+        assertEquals(true, response.isOriginalSeries)
+    }
+}