feat(domain): add Station, Track, PlayerState, DeeplinkService models

app/src/main/java/com/radiola/domain/model/DeeplinkService.kt

@@ -0,0 +1,21 @@
+package com.radiola.domain.model
+
+enum class DeeplinkService(
+    val serviceId: String,
+    val displayName: String,
+    val searchUrlTemplate: String
+) {
+    YANDEX("yandex", "Яндекс Музыка", "https://music.yandex.ru/search?text=%s"),
+    VK("vk", "ВК Музыка", "https://vk.com/audio?q=%s"),
+    BOOM("boom", "BOOM", "https://boom.ru/search?query=%s"),
+    SPOTIFY("spotify", "Spotify", "https://open.spotify.com/search/%s"),
+    APPLE_MUSIC("apple", "Apple Music", "https://music.apple.com/search?term=%s"),
+    YOUTUBE_MUSIC("youtube", "YouTube Music", "https://music.youtube.com/search?q=%s"),
+    TIDAL("tidal", "Tidal", "https://listen.tidal.com/search?q=%s"),
+    DEEZER("deezer", "Deezer", "https://www.deezer.com/search/%s");
+
+    fun buildSearchUrl(artist: String, song: String): String {
+        val query = java.net.URLEncoder.encode("$artist $song", "UTF-8")
+        return searchUrlTemplate.format(query)
+    }
+}

app/src/main/java/com/radiola/domain/model/PlayerState.kt

@@ -0,0 +1,8 @@
+package com.radiola.domain.model
+
+sealed class PlayerState {
+    data object Idle : PlayerState()
+    data class Playing(val station: Station, val track: Track?) : PlayerState()
+    data class Buffering(val station: Station) : PlayerState()
+    data class Error(val message: String) : PlayerState()
+}

app/src/main/java/com/radiola/domain/model/Station.kt

@@ -0,0 +1,12 @@
+package com.radiola.domain.model
+
+data class Station(
+    val id: Int,
+    val name: String,
+    val prefix: String,
+    val streamUrl: String,
+    val coverUrl: String,
+    val genre: String,
+    val tags: List<String>,
+    val sortOrder: Int
+)

app/src/main/java/com/radiola/domain/model/Track.kt

@@ -0,0 +1,8 @@
+package com.radiola.domain.model
+
+data class Track(
+    val artist: String,
+    val song: String,
+    val coverUrl: String?,
+    val stationName: String
+)