init

lib/core/constants/app_defaults.dart

@@ -0,0 +1,15 @@
+class AppDefaults {
+  const AppDefaults._();
+
+  static const int singletonId = 1;
+
+  static const int defaultFreeTrialLimit = 2;
+  static const int nicknameRandomMin = 1000;
+  static const int nicknameRandomMax = 9999;
+
+  static const String defaultAvatarAssetPath =
+      'assets/images/avatar_default.png';
+
+  static const String localDatabaseName = 'arcx_local_first_db';
+  static const String avatarFileName = 'avatar.png';
+}

lib/core/providers/app_providers.dart

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+import 'package:flutter/foundation.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:isar/isar.dart';
+
+import '../../data/local/app_database.dart';
+
+/// Exposes the opened Isar instance. Throws if [AppDatabase.open] has not run.
+final isarProvider = FutureProvider<Isar>((ref) => AppDatabase.instance.open());
+
+/// Apple IAP product identifier for the one-time unlock.
+/// Configure the matching product in App Store Connect when publishing.
+const String kUnlockProductId = 'com.shelingxingqiu.arcx.unlock';
+
+/// Whether the build is a debug build (used to surface a dev-only unlock).
+final bool kIsDebugBuild = kDebugMode;