feat: Update registration data model for Childminder and adjust related screen AM logic

frontend/lib/screens/auth/am/am_register_step1_sceen.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
+import 'package:p_tits_pas/models/am_user_registration_data.dart';
 import 'package:p_tits_pas/models/card_assets.dart';
-import 'package:p_tits_pas/models/parent_user_registration_data.dart';
 import 'package:p_tits_pas/utils/data_generator.dart';
 import 'package:p_tits_pas/widgets/FormFieldConfig.dart';
 import 'package:google_fonts/google_fonts.dart';
@@ -15,7 +15,7 @@ class AmRegisterStep1Screen extends StatefulWidget {
 
 class _AmRegisterStep1ScreenState extends State<AmRegisterStep1Screen> {
   final _formKey = GlobalKey<FormState>();
-  late UserRegistrationData _registrationData;
+  late ChildminderRegistrationData _registrationData;
 
   final _lastNameController = TextEditingController();
   final _firstNameController = TextEditingController();
@@ -27,11 +27,15 @@ class _AmRegisterStep1ScreenState extends State<AmRegisterStep1Screen> {
   final _postalCodeController = TextEditingController();
   final _cityController = TextEditingController();
 
+  // File? _selectedImage;
+  // bool _photoConsent = false;
+  // final ImagePicker _picker = ImagePicker();
+
 
   @override
   void initState() {
     super.initState();
-    _registrationData = UserRegistrationData();
+    _registrationData = ChildminderRegistrationData();
     _generateAndFillData();
   }
 
@@ -152,10 +156,10 @@ class _AmRegisterStep1ScreenState extends State<AmRegisterStep1Screen> {
     ],
   ];
 
-    void _handleSubmit() {
+  void _handleSubmit() {
     if (_formKey.currentState?.validate() ?? false) {
-      _registrationData.updateParent1(
-        ParentData(
+      _registrationData.updateIdentity(
+        ChildminderId(
           firstName: _firstNameController.text,
           lastName: _lastNameController.text,
           address: _addressController.text,
@@ -166,10 +170,12 @@ class _AmRegisterStep1ScreenState extends State<AmRegisterStep1Screen> {
           password: _passwordController.text,
         ),
       );
-      Navigator.pushNamed(context, '/am-register/step2', arguments: _registrationData);
+      Navigator.pushNamed(context, '/am-register/step2',
+          arguments: _registrationData);
     }
   }
 
+  @override
   Widget build(BuildContext context) {
     final screenSize = MediaQuery.of(context).size;
 
@@ -189,7 +195,7 @@ class _AmRegisterStep1ScreenState extends State<AmRegisterStep1Screen> {
                 mainAxisAlignment: MainAxisAlignment.center,
                 children: [
                   Text(
-                    'Étape 1/5',
+                    'Étape 1/4',
                     style: GoogleFonts.merienda(fontSize: 16, color: Colors.black54),
                   ),
                   const SizedBox(height: 10),