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>

pubspec.yaml

@@ -0,0 +1,26 @@
+name: gametime
+description: Offline-first workout planning and tracking app.
+publish_to: 'none'
+
+version: 0.1.0+1
+
+environment:
+  sdk: ^3.10.0
+
+dependencies:
+  flutter:
+    sdk: flutter
+  cupertino_icons: ^1.0.8
+  drift: ^2.34.2
+  drift_flutter: ^0.3.1
+  path: ^1.9.1
+  path_provider: ^2.1.5
+  sqlite3_flutter_libs: ^0.6.0+eol
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  flutter_lints: ^6.0.0
+
+flutter:
+  uses-material-design: true