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/presentation/game_time_app.dart

@@ -0,0 +1,23 @@
+import 'package:flutter/material.dart';
+
+import '../application/app_bootstrap.dart';
+
+final class GameTimeApp extends StatelessWidget {
+  const GameTimeApp({required this.bootstrap, super.key});
+
+  final AppBootstrap bootstrap;
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'GameTime',
+      theme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(seedColor: const Color(0xFF0E7C66)),
+        useMaterial3: true,
+      ),
+      home: const Scaffold(
+        body: SizedBox.shrink(),
+      ),
+    );
+  }
+}

lib/presentation/presentation.dart

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