feat(auth): Supprime l'ancien workflow d'inscription parent et ajoute les assets pour le nouveau workflow

frontend/lib/navigation/app_router.dart

@@ -1,27 +1,23 @@
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 import '../screens/auth/login_screen.dart';
-import '../screens/auth/parent_register_screen.dart';
 import '../screens/home/home_screen.dart';
 
 class AppRouter {
   static const String login = '/login';
-  static const String parentRegister = '/parent-register';
   static const String home = '/home';
 
   static Route<dynamic> generateRoute(RouteSettings settings) {
     switch (settings.name) {
       case login:
         return MaterialPageRoute(builder: (_) => const LoginScreen());
-      case parentRegister:
-        return MaterialPageRoute(builder: (_) => const ParentRegisterScreen());
       case home:
         return MaterialPageRoute(builder: (_) => const HomeScreen());
       default:
         return MaterialPageRoute(
           builder: (_) => Scaffold(
             body: Center(
-              child: Text('Route non définie: ${settings.name}'),
+              child: Text('Route non définie: ${settings.name}'),
             ),
           ),
         );