feat: Version 3.5.2 - Configuration Stripe et gestion des immeubles

- Configuration complète Stripe pour les 3 environnements (DEV/REC/PROD)
  * DEV: Clés TEST Pierre (mode test)
  * REC: Clés TEST Client (mode test)
  * PROD: Clés LIVE Client (mode live)
- Ajout de la gestion des bases de données immeubles/bâtiments
  * Configuration buildings_database pour DEV/REC/PROD
  * Service BuildingService pour enrichissement des adresses
- Optimisations pages et améliorations ergonomie
- Mises à jour des dépendances Composer
- Nettoyage des fichiers obsolètes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/README.md

@@ -0,0 +1,16 @@
+# geosector_app
+
+A new Flutter project.
+
+## Getting Started
+
+This project is a starting point for a Flutter application.
+
+A few resources to get you started if this is your first Flutter project:
+
+- [Lab: Write your first Flutter app](https://docs.flutter.dev/get-started/codelab)
+- [Cookbook: Useful Flutter samples](https://docs.flutter.dev/cookbook)
+
+For help getting started with Flutter development, view the
+[online documentation](https://docs.flutter.dev/), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.