feat: Implement multi-step registration for Childminder with data validation and summary display

- Added routes for registration steps 2, 3, and 4 in app_router.dart.
- Created AmRegisterStep2Screen for entering professional details including birth date, city, country, social security number, agreement number, and max children.
- Implemented validation for social security number and max children fields.
- Developed AmRegisterStep3Screen for entering a motivation message and accepting terms and conditions.
- Created AmRegisterStep4Screen to display a summary of the registration data for review before submission.
- Introduced SummaryCard widget for displaying user information in a structured format.
- Enhanced DataGenerator utility to provide realistic data for testing.

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

@@ -42,16 +42,37 @@ class _AmRegisterStep1ScreenState extends State<AmRegisterStep1Screen> {
   void _generateAndFillData() {
     final String genFirstName = DataGenerator.firstName();
     final String genLastName = DataGenerator.lastName();
+    final String genAddress = DataGenerator.address();
+    final String genPostalCode = DataGenerator.postalCode();
+    final String genCity = DataGenerator.city();
+    final String genPhone = DataGenerator.phone();
+    final String genEmail = DataGenerator.email(genFirstName, genLastName);
+    final String genPassword = DataGenerator.password();
 
-    _addressController.text = DataGenerator.address();
-    _postalCodeController.text = DataGenerator.postalCode();
-    _cityController.text = DataGenerator.city();
+    _addressController.text = genAddress;
+    _postalCodeController.text = genPostalCode;
+    _cityController.text = genCity;
     _firstNameController.text = genFirstName;
     _lastNameController.text = genLastName;
-    _phoneController.text = DataGenerator.phone();
-    _emailController.text = DataGenerator.email(genFirstName, genLastName);
-    _passwordController.text = DataGenerator.password();
-    _confirmPasswordController.text = _passwordController.text;
+    _phoneController.text = genPhone;
+    _emailController.text = genEmail;
+    _passwordController.text = genPassword;
+    _confirmPasswordController.text = genPassword;
+
+    setState(() {
+      _registrationData.updateIdentity(
+        ChildminderId(
+          firstName: genFirstName,
+          lastName: genLastName,
+          address: genAddress,
+          postalCode: genPostalCode,
+          city: genCity,
+          phone: genPhone,
+          email: genEmail,
+          password: genPassword.trim(),
+        ),
+      );
+    });
   }
 
   @override
@@ -170,6 +191,10 @@ class _AmRegisterStep1ScreenState extends State<AmRegisterStep1Screen> {
           password: _passwordController.text,
         ),
       );
+      print('Vérification des données:');
+      print('Adresse: ${_registrationData.identity.address}');
+      print('Nom: ${_registrationData.identity.lastName}');
+      print('Prénom: ${_registrationData.identity.firstName}');
       Navigator.pushNamed(context, '/am-register/step2',
           arguments: _registrationData);
     }