feat(inscription): email accusé réception, photos enfants, formulaires identité

- Backend: mail après inscription parent avec n° dossier, UPLOAD_PHOTOS_DIR, réponse API
- Frontend: imageBytes + payload photo, utils email/code postal/téléphone, champs dédiés
- Formulaires admin, login (focus), personal_info, child_card, custom_app_text_field

Made-with: Cursor

frontend/lib/screens/administrateurs/creation/admin_create.dart

@@ -1,8 +1,10 @@
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
 import 'package:p_tits_pas/utils/phone_utils.dart';
 import 'package:p_tits_pas/models/user.dart';
 import 'package:p_tits_pas/services/user_service.dart';
+import 'package:p_tits_pas/utils/email_utils.dart';
+import 'package:p_tits_pas/widgets/email_text_field.dart';
+import 'package:p_tits_pas/widgets/french_phone_field.dart';
 
 class AdminCreateDialog extends StatefulWidget {
   final AppUser? initialUser;
@@ -61,11 +63,10 @@ class _AdminCreateDialogState extends State<AdminCreateDialog> {
 
   String? _validateEmail(String? value) {
     final base = _required(value, 'Email');
-    if (base != null) return base;
-    final email = value!.trim();
-    final ok = RegExp(r'^[^@]+@[^@]+\.[^@]+$').hasMatch(email);
-    if (!ok) return 'Format email invalide';
-    return null;
+    if (base != null) {
+      return base;
+    }
+    return validateEmail(value, allowEmpty: true);
   }
 
   String? _validatePassword(String? value) {
@@ -78,6 +79,17 @@ class _AdminCreateDialogState extends State<AdminCreateDialog> {
     return null;
   }
 
+  String? _validateTelephone(String? value) {
+    if (_isEditMode && (value == null || value.trim().isEmpty)) {
+      return null;
+    }
+    final base = _required(value, 'Téléphone');
+    if (base != null) {
+      return base;
+    }
+    return validateFrenchNationalPhone(value, allowEmpty: false);
+  }
+
   Future<void> _submit() async {
     if (_isSubmitting) return;
     if (!_formKey.currentState!.validate()) return;
@@ -305,13 +317,9 @@ class _AdminCreateDialogState extends State<AdminCreateDialog> {
   }
 
   Widget _buildEmailField() {
-    return TextFormField(
+    return EmailTextFormField(
       controller: _emailController,
-      keyboardType: TextInputType.emailAddress,
-      decoration: const InputDecoration(
-        labelText: 'Email',
-        border: OutlineInputBorder(),
-      ),
+      label: 'Email',
       validator: _validateEmail,
     );
   }
@@ -346,19 +354,10 @@ class _AdminCreateDialogState extends State<AdminCreateDialog> {
   }
 
   Widget _buildTelephoneField() {
-    return TextFormField(
+    return FrenchPhoneTextFormField(
       controller: _telephoneController,
-      keyboardType: TextInputType.phone,
-      inputFormatters: [
-        FilteringTextInputFormatter.digitsOnly,
-        LengthLimitingTextInputFormatter(10),
-        FrenchPhoneNumberFormatter(),
-      ],
-      decoration: const InputDecoration(
-        labelText: 'Téléphone (ex: 06 12 34 56 78)',
-        border: OutlineInputBorder(),
-      ),
-      validator: (v) => _required(v, 'Téléphone'),
+      label: 'Téléphone (ex: 06 12 34 56 78)',
+      validator: _validateTelephone,
     );
   }
 }