fix(audio): make the audio diagnostics visible in release builds

Every diagnostic line in the audio path used `dart:developer`'s `log()`.
That function writes to the VM service, which a RELEASE build does not
have — so in the only build that ever runs in a car, all eleven of them
went nowhere. `debugPrint`/`print` do reach logcat in release; `log()`
does not.

That includes the two channels built specifically to end the guessing:
- `registrarErrorAudioService`, which subscribes to
  `AudioService.asyncError` so the plugin's swallowed platform exceptions
  stop vanishing (b0271fa). It moved them from a dropped PublishSubject
  to a dropped log call.
- `_trazarEstadoPublicado`, the published-state trace added in 7054a4c to
  settle why the car's play button never becomes pause.

So "no evidence" was never a quiet app. It was an app writing its
evidence somewhere release builds discard. Several rounds of hypotheses
were argued without data that the app was already producing.

All eleven now use `debugPrint` with a `[PluriWave][Tag]` prefix, so one
filter catches the audio path and the existing alarm lines together:

  adb logcat | grep PluriWave

No behaviour changes. Tests: 1158, unchanged.

lib/servicios/servicio_audio.dart

@@ -1,9 +1,8 @@
 import 'dart:async';
-import 'dart:developer' as developer;
 import 'dart:ui' show Locale;
 
 import 'package:audio_service/audio_service.dart';
-import 'package:flutter/foundation.dart' show visibleForTesting;
+import 'package:flutter/foundation.dart' show debugPrint, visibleForTesting;
 import 'package:just_audio/just_audio.dart';
 
 import '../l10n/display_names.dart';
@@ -836,7 +835,14 @@ class PluriWaveAudioHandler extends BaseAudioHandler
   /// `eqDisponible` rides along because the equalizer custom action is gated
   /// on it and the flag is otherwise unobservable — one car session answers
   /// both questions at once:
-  ///   adb logcat -s ServicioAudio
+  ///
+  ///   adb logcat | grep PluriWave
+  ///
+  /// It uses [debugPrint] and NOT `dart:developer`'s `log`, and that is not a
+  /// style choice. `log()` writes to the VM service, which a RELEASE build
+  /// does not have — so this trace, and every error line in this file, was
+  /// invisible in the only build that ever runs in a car. Weeks of "no
+  /// evidence" were this, not a quiet app. Do not convert these back.
   void _trazarEstadoPublicado() {
     final s = playbackState.value;
     final traza =
@@ -846,7 +852,7 @@ class PluriWaveAudioHandler extends BaseAudioHandler
         'controles=${s.controls.length}';
     if (traza == _ultimaTrazaEstado) return;
     _ultimaTrazaEstado = traza;
-    developer.log(traza, name: 'ServicioAudio');
+    debugPrint('[PluriWave][ServicioAudio] estado $traza');
   }
 
   /// Binds [construirControlesTransporte] — which holds the whole contract,
@@ -909,11 +915,7 @@ class PluriWaveAudioHandler extends BaseAudioHandler
       mensaje = _textos.audioErrorGeneric;
     }
 
-    developer.log(
-      '[PluriWave] Error reproducción: $codigoLog',
-      name: 'ServicioAudio',
-      level: 900,
-    );
+    debugPrint('[PluriWave][ServicioAudio] Error reproducción: $codigoLog');
 
     _detenerReconexion();
     playbackState.add(
@@ -956,12 +958,10 @@ class PluriWaveAudioHandler extends BaseAudioHandler
     }
 
     _reconectando = true;
-    developer.log(
-      '[PluriWave] Stall de red, reintento ${_reconexion.intentos}/'
+    debugPrint(
+      '[PluriWave][ServicioAudio] Stall de red, reintento ${_reconexion.intentos}/'
       '${_reconexion.maxReintentos} en '
       '${_reconexion.retrasoParaIntento(_reconexion.intentos).inSeconds}s',
-      name: 'ServicioAudio',
-      level: 800,
     );
     playbackState.add(
       playbackState.value.copyWith(
@@ -1207,11 +1207,8 @@ class PluriWaveAudioHandler extends BaseAudioHandler
       rethrow;
     } on Exception catch (e, stackTrace) {
       _cambiandoFuente = false;
-      developer.log(
-        '[PluriWave] Error inesperado en playMediaItem: $e',
-        name: 'ServicioAudio',
-        level: 900,
-        stackTrace: stackTrace,
+      debugPrint(
+        '[PluriWave][ServicioAudio] Error inesperado en playMediaItem: $e',
       );
       if (revision == _revisionFuente) {
         playbackState.add(
@@ -1264,11 +1261,8 @@ class PluriWaveAudioHandler extends BaseAudioHandler
   void _iniciarPlaySinBloquear(MediaItem mediaItem, int revision) {
     unawaited(
       _player.play().catchError((Object error, StackTrace stackTrace) {
-        developer.log(
-          '[PluriWave] Error al iniciar ${mediaItem.title}: $error',
-          name: 'ServicioAudio',
-          level: 900,
-          stackTrace: stackTrace,
+        debugPrint(
+          '[PluriWave][ServicioAudio] Error al iniciar ${mediaItem.title}: $error',
         );
         if (revision == _revisionFuente) {
           _gestionarErrorReproduccion(error);
@@ -1553,11 +1547,7 @@ class PluriWaveAudioHandler extends BaseAudioHandler
       if (destino == null) return;
       await playMediaItem(mediaItemParaEmisora(destino, l10n: _textos));
     } catch (e) {
-      developer.log(
-        '[PluriWave] Error saltando de emisora: $e',
-        name: 'ServicioAudio',
-        level: 900,
-      );
+      debugPrint('[PluriWave][ServicioAudio] Error saltando de emisora: $e');
     }
   }
 
@@ -1720,10 +1710,8 @@ class PluriWaveAudioHandler extends BaseAudioHandler
       if (emisora == null) return;
       await playMediaItem(mediaItemParaEmisora(emisora, l10n: _textos));
     } catch (e) {
-      developer.log(
-        '[PluriWave] Error en playFromSearch($query): $e',
-        name: 'ServicioAudio',
-        level: 900,
+      debugPrint(
+        '[PluriWave][ServicioAudio] Error en playFromSearch($query): $e',
       );
     }
   }
@@ -1793,10 +1781,8 @@ class PluriWaveAudioHandler extends BaseAudioHandler
       );
     } catch (e) {
       // Spec "Unknown or stale media id": never propagate from the handler.
-      developer.log(
-        '[PluriWave] Error en playFromMediaId($mediaId): $e',
-        name: 'ServicioAudio',
-        level: 900,
+      debugPrint(
+        '[PluriWave][ServicioAudio] Error en playFromMediaId($mediaId): $e',
       );
     }
   }