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/UpdateManager.java

@@ -31,10 +31,10 @@ import java.lang.ref.WeakReference;
 import java.util.Locale;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
-import java.util.concurrent.TimeUnit;
 
 import okhttp3.OkHttpClient;
 import okhttp3.Request;
+import okhttp3.Request;
 import okhttp3.Response;
 
 /**
@@ -63,11 +63,8 @@ public class UpdateManager {
         this.appContext = context.getApplicationContext();
         this.mainHandler = new Handler(Looper.getMainLooper());
         this.networkExecutor = Executors.newSingleThreadExecutor();
-        this.httpClient = new OkHttpClient.Builder()
-                .connectTimeout(15, TimeUnit.SECONDS)
-                .readTimeout(20, TimeUnit.SECONDS)
-                .callTimeout(25, TimeUnit.SECONDS)
-                .build();
+        // Usar NetworkUtils para obtener cliente con DNS over HTTPS configurado
+        this.httpClient = NetworkUtils.getClient();
     }
 
     public void checkForUpdates(UpdateCallback callback) {