feat(app): scaffolding initial du projet Flutter GameTime

Structure Flutter iOS/Android (lib/ organisé en couches domain,
application, infrastructure, presentation), intégration Drift pour la
persistance locale (sqlite3_flutter_libs), configuration des plateformes
android/ et ios/. Build APK debug validé.

Ajuste le .gitignore pour ignorer l'état d'exécution IdeA
(.ideai/permissions.json) au même titre que le reste du runtime.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

lib/infrastructure/infrastructure.dart

@@ -0,0 +1,5 @@
+/// Infrastructure layer entry point.
+///
+/// Concrete adapters live here and depend inward on application/domain
+/// contracts.
+library;

lib/infrastructure/local/app_database.dart

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+import 'package:drift/drift.dart';
+import 'package:drift_flutter/drift_flutter.dart';
+
+final class AppDatabase extends GeneratedDatabase {
+  AppDatabase(DatabaseConnection connection) : super.connect(connection);
+
+  factory AppDatabase.open() {
+    return AppDatabase(
+      driftDatabase(
+        name: 'gametime',
+        native: const DriftNativeOptions(
+          shareAcrossIsolates: true,
+        ),
+      ),
+    );
+  }
+
+  @override
+  int get schemaVersion => 1;
+
+  @override
+  Iterable<TableInfo<Table, dynamic>> get allTables => const [];
+}

lib/infrastructure/local/local.dart

@@ -0,0 +1 @@
+export 'app_database.dart';