feat: WebSocket now-playing via Socket.IO from backend

app/src/main/java/com/radiola/data/repository/NowPlayingRepositoryImpl.kt

@@ -1,5 +1,6 @@
 package com.radiola.data.repository
 
+import com.radiola.data.remote.NowPlayingSocketClient
 import com.radiola.data.remote.RecordApi
 import com.radiola.data.remote.ApiMapper.toDomain
 import com.radiola.domain.model.Track
@@ -10,16 +11,21 @@ import kotlinx.coroutines.flow.map
 import javax.inject.Inject
 
 class NowPlayingRepositoryImpl @Inject constructor(
-    private val api: RecordApi
+    private val api: RecordApi,
+    private val socketClient: NowPlayingSocketClient
 ) : NowPlayingRepository {
 
     private val _nowPlaying = MutableStateFlow<Map<Int, Track>>(emptyMap())
 
-    override fun getNowPlaying(stationId: Int): Flow<Track?> {
-        return _nowPlaying.map { it[stationId] }
+    init {
+        socketClient.connect()
     }
 
-    override fun getAllNowPlaying(): Flow<Map<Int, Track>> = _nowPlaying
+    override fun getNowPlaying(stationId: Int): Flow<Track?> {
+        return socketClient.nowPlaying.map { it[stationId] }
+    }
+
+    override fun getAllNowPlaying(): Flow<Map<Int, Track>> = socketClient.nowPlaying
 
     override suspend fun refreshNowPlaying(): Result<Unit> {
         return try {