Fix DNS issues: Add 4 DoH servers with fallback, remove ineffective DNSSetter

- Remove DNSSetter.java (System.setProperty doesn't affect Android DNS)
- Update NetworkUtils with 4 DNS over HTTPS providers:
  * Google DNS (8.8.8.8) - Primary
  * Cloudflare (1.1.1.1) - Secondary
  * AdGuard (94.140.14.14) - Tertiary
  * Quad9 (9.9.9.9) - Quaternary
- Update DeviceRegistry to use NetworkUtils client
- Update UpdateManager to use NetworkUtils client
- Remove DNSSetter call from PlayerActivity

This ensures the app works even when ISPs block specific DNS servers.

app/src/main/java/com/streamplayer/DeviceRegistry.java

@@ -15,7 +15,6 @@ import java.io.IOException;
 import java.util.Locale;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
-import java.util.concurrent.TimeUnit;
 
 import okhttp3.MediaType;
 import okhttp3.OkHttpClient;
@@ -46,11 +45,8 @@ public class DeviceRegistry {
 
     public DeviceRegistry(Context context) {
         this.appContext = context.getApplicationContext();
-        this.httpClient = new OkHttpClient.Builder()
-                .connectTimeout(10, TimeUnit.SECONDS)
-                .readTimeout(15, TimeUnit.SECONDS)
-                .callTimeout(20, TimeUnit.SECONDS)
-                .build();
+        // Usar NetworkUtils para obtener cliente con DNS over HTTPS configurado
+        this.httpClient = NetworkUtils.getClient();
         this.executorService = Executors.newSingleThreadExecutor();
     }