feat(iap): add freemium unlock via one-time in-app purchase

Adds a permanent, non-consumable premium unlock (EstadoEntitlement +
PuertoCompras/ServicioComprasPlayBilling) that removes ads and unlocks
alarm vacations, alarms past a 5-alarm free cap, recording start, and
full Android Auto browsing. The phone equalizer stays free for everyone.

- Entitlement is prefs-backed (compra_premium_v1), fail-open, and
  resolvable headlessly via esPremiumPersistido() for the Android Auto
  audio handler, which registers before runApp.
- Android Auto reduced mode keeps the real root folder labels for free
  users; browsing into any of them (and playFromMediaId/playFromSearch/
  skipToNext/skipToPrevious) is blocked at the getChildren/servicio_audio
  choke points, with a locked "Función Premium" item as the backstop.
  Current-station play/pause/stop stays untouched. A free -> premium
  transition actively invalidates the head unit's cached browse tree.
- Ads (top banner + capped interstitial before adding a station or an
  alarm) are gated behind entitlement via ServicioAnuncios, using
  official Google test ad unit IDs pending AdMob provisioning.
- Alarm cap UX shows an explanatory message with a secondary unlock
  action rather than a bare paywall jump; existing data is grandfathered.
- 4 new localization keys translated across all 13 supported locales.

Co-located tests use strict TDD (RED test before implementation) for
every new pure-logic unit; full existing suite passes unchanged.

lib/l10n/app_ja.arb

@@ -897,5 +897,9 @@
   "alarmDiagnosticsFixAction": "修正する",
   "alarmDiagnosticsIntentUnavailable": "この端末では設定画面を開けませんでした。設定アプリ内で手動で探してみてください。",
   "alarmDiagnosticsUnavailableHint": "アラームの設定をまだ確認できていません。",
-  "autoEqDisableOption": "無効化"
+  "autoEqDisableOption": "無効化",
+  "funcionPremium": "プレミアム機能",
+  "limiteAlarmasAlcanzado": "無料プランのアラーム上限（5件）に達しました。",
+  "desbloquearPremium": "プレミアムを解除",
+  "restaurarCompras": "購入を復元"
 }