feat(ads): ref-constructed ad/consent/iap providers, single ownership source

lib/state/providers.dart

@@ -4,8 +4,11 @@ import '../data/content_repository.dart';
 import '../data/save_repository.dart';
 import '../data/streak.dart';
 import '../game/models/season.dart';
+import '../services/ad_service.dart';
 import '../services/analytics_service.dart';
 import '../services/audio_service.dart';
+import '../services/consent_service.dart';
+import '../services/iap_service.dart';
 import 'ads_notifier.dart';
 import 'endless_best_notifier.dart';
 import 'game_session_notifier.dart';
@@ -75,6 +78,30 @@ final endlessBestProvider = NotifierProvider<EndlessBestNotifier, int>(
 final adsRemovedProvider =
     NotifierProvider<AdsRemovedNotifier, bool>(AdsRemovedNotifier.new);
 
+/// Reads ownership live from [adsRemovedProvider]; a mid-session purchase
+/// takes effect on the next ad decision without re-wiring.
+final adServiceProvider = Provider<AdService>((ref) {
+  final service = AdService(adsRemoved: () => ref.read(adsRemovedProvider));
+  ref.onDispose(service.dispose);
+  return service;
+});
+
+final consentServiceProvider = Provider<ConsentService>(
+  (ref) => ConsentService(ref.read(adServiceProvider)),
+);
+
+/// A verified remove_ads purchase/restore grants the entitlement through the
+/// notifier (persists + flips state), which AdService and the banner observe.
+final iapServiceProvider = Provider<IapService>((ref) {
+  final service = IapService(
+    onEntitlementGranted: () =>
+        ref.read(adsRemovedProvider.notifier).grant(),
+  );
+  ref.onDispose(service.dispose);
+  service.initialize();
+  return service;
+});
+
 final analyticsProvider = Provider<AnalyticsService>(
   (ref) => AnalyticsService(DebugAnalyticsBackend()),
 );