feat(creator-channel): 후원 탭 응답 조립을 추가한다

src/main/kotlin/kr/co/vividnext/sodalive/v2/api/creator/channel/donation/application/CreatorChannelDonationFacade.kt

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+package kr.co.vividnext.sodalive.v2.api.creator.channel.donation.application
+
+import kr.co.vividnext.sodalive.member.Member
+import kr.co.vividnext.sodalive.v2.api.creator.channel.donation.dto.CreatorChannelDonationTabResponse
+import kr.co.vividnext.sodalive.v2.creator.channel.donation.application.CreatorChannelDonationQueryService
+import org.springframework.stereotype.Service
+import org.springframework.transaction.annotation.Transactional
+import java.time.LocalDateTime
+
+@Service
+@Transactional(readOnly = true)
+class CreatorChannelDonationFacade(
+    private val creatorChannelDonationQueryService: CreatorChannelDonationQueryService
+) {
+    fun getDonationTab(
+        creatorId: Long,
+        viewer: Member,
+        page: Int?,
+        size: Int?,
+        now: LocalDateTime = LocalDateTime.now()
+    ): CreatorChannelDonationTabResponse {
+        return CreatorChannelDonationTabResponse.from(
+            creatorChannelDonationQueryService.getDonationTab(
+                creatorId = creatorId,
+                viewer = viewer,
+                page = page,
+                size = size,
+                now = now
+            )
+        )
+    }
+}

src/main/kotlin/kr/co/vividnext/sodalive/v2/api/creator/channel/donation/dto/CreatorChannelDonationTabResponse.kt

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+package kr.co.vividnext.sodalive.v2.api.creator.channel.donation.dto
+
+import com.fasterxml.jackson.annotation.JsonProperty
+import kr.co.vividnext.sodalive.extensions.toUtcIso
+import kr.co.vividnext.sodalive.v2.creator.channel.donation.domain.CreatorChannelDonation
+import kr.co.vividnext.sodalive.v2.creator.channel.donation.domain.CreatorChannelDonationRanking
+import kr.co.vividnext.sodalive.v2.creator.channel.donation.domain.CreatorChannelDonationTab
+
+data class CreatorChannelDonationTabResponse(
+    val donationCount: Int,
+    val rankings: List<MemberDonationRankingResponse>,
+    val donations: List<CreatorChannelDonationResponse>,
+    val page: Int,
+    val size: Int,
+    @JsonProperty("hasNext")
+    val hasNext: Boolean
+) {
+    companion object {
+        fun from(tab: CreatorChannelDonationTab): CreatorChannelDonationTabResponse {
+            return CreatorChannelDonationTabResponse(
+                donationCount = tab.donationCount,
+                rankings = tab.rankings.map(MemberDonationRankingResponse::from),
+                donations = tab.donations.map(CreatorChannelDonationResponse::from),
+                page = tab.page.page,
+                size = tab.page.size,
+                hasNext = tab.hasNext
+            )
+        }
+    }
+}
+
+data class MemberDonationRankingResponse(
+    @JsonProperty("userId") val userId: Long,
+    @JsonProperty("nickname") val nickname: String,
+    @JsonProperty("profileImage") val profileImage: String,
+    @JsonProperty("donationCan") val donationCan: Int
+) {
+    companion object {
+        fun from(ranking: CreatorChannelDonationRanking): MemberDonationRankingResponse {
+            return MemberDonationRankingResponse(
+                userId = ranking.userId,
+                nickname = ranking.nickname,
+                profileImage = ranking.profileImage,
+                donationCan = ranking.donationCan
+            )
+        }
+    }
+}
+
+data class CreatorChannelDonationResponse(
+    val nickname: String,
+    val profileImageUrl: String,
+    val can: Int,
+    val message: String,
+    val createdAtUtc: String
+) {
+    companion object {
+        fun from(donation: CreatorChannelDonation): CreatorChannelDonationResponse {
+            return CreatorChannelDonationResponse(
+                nickname = donation.nickname,
+                profileImageUrl = donation.profileImageUrl,
+                can = donation.can,
+                message = donation.message,
+                createdAtUtc = donation.createdAt.toUtcIso()
+            )
+        }
+    }
+}

src/test/kotlin/kr/co/vividnext/sodalive/v2/api/creator/channel/donation/application/CreatorChannelDonationFacadeTest.kt

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+package kr.co.vividnext.sodalive.v2.api.creator.channel.donation.application
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.module.kotlin.KotlinModule
+import kr.co.vividnext.sodalive.member.Member
+import kr.co.vividnext.sodalive.member.MemberRole
+import kr.co.vividnext.sodalive.v2.api.creator.channel.donation.dto.CreatorChannelDonationTabResponse
+import kr.co.vividnext.sodalive.v2.creator.channel.donation.application.CreatorChannelDonationQueryService
+import kr.co.vividnext.sodalive.v2.creator.channel.donation.domain.CreatorChannelDonation
+import kr.co.vividnext.sodalive.v2.creator.channel.donation.domain.CreatorChannelDonationRanking
+import kr.co.vividnext.sodalive.v2.creator.channel.donation.domain.CreatorChannelDonationTab
+import kr.co.vividnext.sodalive.v2.creator.channel.live.domain.CreatorChannelPage
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertFalse
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+import org.mockito.Mockito
+import java.time.LocalDateTime
+
+class CreatorChannelDonationFacadeTest {
+    @Test
+    @DisplayName("후원 탭 응답 DTO는 domain tab 값을 공개 응답 필드와 UTC 문자열로 매핑한다")
+    fun shouldMapDonationTabDomainToPublicResponse() {
+        val response = CreatorChannelDonationTabResponse.from(createTab())
+
+        assertEquals(3, response.donationCount)
+        assertEquals(10L, response.rankings.first().userId)
+        assertEquals("fan", response.rankings.first().nickname)
+        assertEquals("https://cdn.test/fan.png", response.rankings.first().profileImage)
+        assertEquals(100, response.rankings.first().donationCan)
+        assertEquals("donor", response.donations.first().nickname)
+        assertEquals("https://cdn.test/donor.png", response.donations.first().profileImageUrl)
+        assertEquals(50, response.donations.first().can)
+        assertEquals("thanks", response.donations.first().message)
+        assertEquals("2026-06-21T03:30:00Z", response.donations.first().createdAtUtc)
+        assertEquals(1, response.page)
+        assertEquals(20, response.size)
+        assertTrue(response.hasNext)
+
+        val mapper = ObjectMapper().registerModule(KotlinModule.Builder().build())
+        val json = mapper.readTree(mapper.writeValueAsString(response))
+        assertEquals(10L, json["rankings"][0]["userId"].asLong())
+        assertEquals("fan", json["rankings"][0]["nickname"].asText())
+        assertEquals("https://cdn.test/fan.png", json["rankings"][0]["profileImage"].asText())
+        assertEquals(100, json["rankings"][0]["donationCan"].asInt())
+        assertEquals("donor", json["donations"][0]["nickname"].asText())
+        assertEquals("https://cdn.test/donor.png", json["donations"][0]["profileImageUrl"].asText())
+        assertEquals(50, json["donations"][0]["can"].asInt())
+        assertEquals("thanks", json["donations"][0]["message"].asText())
+        assertEquals("2026-06-21T03:30:00Z", json["donations"][0]["createdAtUtc"].asText())
+        assertTrue(json["hasNext"].asBoolean())
+        assertFalse(json.has("languageCode"))
+    }
+
+    @Test
+    @DisplayName("후원 탭 facade는 query service 결과를 공개 응답 DTO로 변환한다")
+    fun shouldMapDonationTabQueryResultToPublicResponse() {
+        val service = Mockito.mock(CreatorChannelDonationQueryService::class.java)
+        val facade = CreatorChannelDonationFacade(service)
+        val viewer = createMember(id = 10L)
+        val now = LocalDateTime.of(2026, 6, 21, 12, 0)
+        Mockito.doReturn(createTab()).`when`(service).getDonationTab(
+            creatorId = 1L,
+            viewer = viewer,
+            page = -1,
+            size = 100,
+            now = now
+        )
+
+        val response = facade.getDonationTab(
+            creatorId = 1L,
+            viewer = viewer,
+            page = -1,
+            size = 100,
+            now = now
+        )
+
+        assertEquals(3, response.donationCount)
+        assertEquals(10L, response.rankings.first().userId)
+        assertEquals("https://cdn.test/donor.png", response.donations.first().profileImageUrl)
+        assertEquals(1, response.page)
+        assertEquals(20, response.size)
+        assertTrue(response.hasNext)
+    }
+
+    private fun createMember(id: Long): Member {
+        return Member(
+            email = "viewer$id@test.com",
+            password = "password",
+            nickname = "viewer$id",
+            role = MemberRole.USER
+        ).apply { this.id = id }
+    }
+
+    private fun createTab(): CreatorChannelDonationTab {
+        return CreatorChannelDonationTab(
+            donationCount = 3,
+            rankings = listOf(
+                CreatorChannelDonationRanking(
+                    userId = 10L,
+                    nickname = "fan",
+                    profileImage = "https://cdn.test/fan.png",
+                    donationCan = 100
+                )
+            ),
+            donations = listOf(
+                CreatorChannelDonation(
+                    nickname = "donor",
+                    profileImageUrl = "https://cdn.test/donor.png",
+                    can = 50,
+                    message = "thanks",
+                    createdAt = LocalDateTime.of(2026, 6, 21, 3, 30)
+                )
+            ),
+            page = CreatorChannelPage(page = 1, size = 20),
+            hasNext = true
+        )
+    }
+}