feat(data): add Retrofit API, DTOs and mappers

app/src/main/java/com/radiola/data/remote/ApiMapper.kt

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+package com.radiola.data.remote
+
+import com.radiola.data.remote.dto.NowPlayingItemDto
+import com.radiola.data.remote.dto.StationDto
+import com.radiola.domain.model.Station
+import com.radiola.domain.model.Track
+
+object ApiMapper {
+
+    fun StationDto.toDomain(): Station {
+        val cover = iconPng ?: iconSvg ?: ""
+        return Station(
+            id = id,
+            name = name,
+            prefix = prefix,
+            streamUrl = "https://air.radiorecord.ru:805/${prefix}_128",
+            coverUrl = cover,
+            genre = genre ?: "",
+            tags = emptyList(),
+            sortOrder = id
+        )
+    }
+
+    fun NowPlayingItemDto.toDomain(): Track {
+        return Track(
+            artist = artist,
+            song = song,
+            coverUrl = image600 ?: image100,
+            stationName = prefix
+        )
+    }
+}

app/src/main/java/com/radiola/data/remote/RecordApi.kt

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+package com.radiola.data.remote
+
+import com.radiola.data.remote.dto.NowPlayingResponse
+import com.radiola.data.remote.dto.StationsResponse
+import retrofit2.http.GET
+
+interface RecordApi {
+
+    @GET("api/stations/")
+    suspend fun getStations(): StationsResponse
+
+    @GET("api/stations/now/")
+    suspend fun getNowPlaying(): NowPlayingResponse
+}

app/src/main/java/com/radiola/data/remote/dto/NowPlayingDto.kt

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+package com.radiola.data.remote.dto
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class NowPlayingItemDto(
+    @SerialName("id") val id: Int,
+    @SerialName("prefix") val prefix: String,
+    @SerialName("artist") val artist: String,
+    @SerialName("song") val song: String,
+    @SerialName("image600") val image600: String? = null,
+    @SerialName("image100") val image100: String? = null
+)
+
+@Serializable
+data class NowPlayingResponse(
+    @SerialName("result") val result: List<NowPlayingItemDto>
+)

app/src/main/java/com/radiola/data/remote/dto/StationDto.kt

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+package com.radiola.data.remote.dto
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class StationDto(
+    @SerialName("id") val id: Int,
+    @SerialName("title") val name: String,
+    @SerialName("prefix") val prefix: String,
+    @SerialName("genre") val genre: String? = null,
+    @SerialName("icon_png") val iconPng: String? = null,
+    @SerialName("icon_svg") val iconSvg: String? = null
+)
+
+@Serializable
+data class StationsResponse(
+    @SerialName("result") val result: List<StationDto>
+)