feat(#53): converted banner service classes java to kotlin

archive-application/src/main/kotlin/site/archive/service/banner/BannerService.kt

@@ -0,0 +1,33 @@
+package site.archive.service.banner
+
+import org.springframework.stereotype.Service
+import org.springframework.transaction.annotation.Transactional
+import site.archive.domain.banner.Banner
+import site.archive.domain.banner.BannerRepository
+import site.archive.domain.banner.BannerType
+import site.archive.dto.v2.BannerListResponseDto
+import site.archive.dto.v2.BannerResponseDto
+
+@Service
+@Transactional(readOnly = true)
+class BannerService(val bannerRepository: BannerRepository) {
+
+    fun getAllBanner(): BannerListResponseDto {
+        val bannerResponse = bannerRepository.findAllByOrderByCreatedAtDesc()
+            .map { BannerResponseDto(it.type.toString(), it.summaryImage, it.mainContent) }
+            .toList()
+        return BannerListResponseDto(bannerResponse)
+    }
+
+    @Transactional
+    fun createBanner(summaryImageUri: String, mainContent: String, type: BannerType): BannerResponseDto {
+        val banner = bannerRepository.save(Banner(summaryImageUri, mainContent, type))
+        return BannerResponseDto.from(banner)
+    }
+
+    @Transactional
+    fun deleteBanner(bannerId: Long) {
+        bannerRepository.deleteById(bannerId)
+    }
+
+}