feat(lyrics): тексты песен внутри приложения через LRCLIB

- LrcLibApi (api/get + api/search, User-Agent), DI @Named(lrclib) Retrofit
- LyricsRepository.fetchLyrics -> LyricsResult (plain/synced/instrumental)
- LyricsViewModel + LyricsSheet (загрузка/инструментал/найдено/не найдено),
  прокрутка + атрибуция LRCLIB
- кнопка «Текст песни» открывает встроенный экран (плеер + деталь трека чартов),
  вместо ссылки в браузере

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

@@ -0,0 +1,24 @@
+package com.radiola.data.remote
+
+import com.radiola.data.remote.dto.LrcLibLyricsDto
+import retrofit2.http.GET
+import retrofit2.http.Header
+import retrofit2.http.Query
+
+interface LrcLibApi {
+
+    @GET("api/get")
+    suspend fun get(
+        @Header("User-Agent") userAgent: String = "radiOLA Android (https://radiorecord.ru)",
+        @Query("artist_name") artistName: String,
+        @Query("track_name") trackName: String,
+        @Query("duration") durationSec: Int? = null
+    ): LrcLibLyricsDto
+
+    @GET("api/search")
+    suspend fun search(
+        @Header("User-Agent") userAgent: String = "radiOLA Android (https://radiorecord.ru)",
+        @Query("artist_name") artistName: String,
+        @Query("track_name") trackName: String
+    ): List<LrcLibLyricsDto>
+}

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

@@ -0,0 +1,16 @@
+package com.radiola.data.remote.dto
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class LrcLibLyricsDto(
+    @SerialName("id") val id: Int? = null,
+    @SerialName("trackName") val trackName: String? = null,
+    @SerialName("artistName") val artistName: String? = null,
+    @SerialName("albumName") val albumName: String? = null,
+    @SerialName("duration") val duration: Double? = null,
+    @SerialName("instrumental") val instrumental: Boolean = false,
+    @SerialName("plainLyrics") val plainLyrics: String? = null,
+    @SerialName("syncedLyrics") val syncedLyrics: String? = null
+)