fix(auth): correctif login et parsing user (version stable)

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/lib/models/user.dart

@@ -32,30 +32,42 @@ class AppUser {
   });
 
   factory AppUser.fromJson(Map<String, dynamic> json) {
+    final id = json['id']?.toString();
+    final email = json['email']?.toString();
+    final role = json['role']?.toString();
+    if (id == null || id.isEmpty) {
+      throw Exception('Profil invalide: id manquant');
+    }
+    if (email == null || email.isEmpty) {
+      throw Exception('Profil invalide: email manquant');
+    }
+    if (role == null || role.isEmpty) {
+      throw Exception('Profil invalide: rôle manquant');
+    }
     return AppUser(
-      id: json['id'] as String,
-      email: json['email'] as String,
-      role: json['role'] as String,
+      id: id,
+      email: email,
+      role: role,
       createdAt: json['cree_le'] != null
-          ? DateTime.parse(json['cree_le'] as String)
+          ? DateTime.tryParse(json['cree_le'].toString()) ?? DateTime.now()
           : (json['createdAt'] != null
-              ? DateTime.parse(json['createdAt'] as String)
+              ? DateTime.tryParse(json['createdAt'].toString()) ?? DateTime.now()
               : DateTime.now()),
       updatedAt: json['modifie_le'] != null
-          ? DateTime.parse(json['modifie_le'] as String)
+          ? DateTime.tryParse(json['modifie_le'].toString()) ?? DateTime.now()
           : (json['updatedAt'] != null
-              ? DateTime.parse(json['updatedAt'] as String)
+              ? DateTime.tryParse(json['updatedAt'].toString()) ?? DateTime.now()
               : DateTime.now()),
       changementMdpObligatoire:
-          json['changement_mdp_obligatoire'] as bool? ?? false,
-      nom: json['nom'] as String?,
-      prenom: json['prenom'] as String?,
-      statut: json['statut'] as String?,
-      telephone: json['telephone'] as String?,
-      photoUrl: json['photo_url'] as String?,
-      adresse: json['adresse'] as String?,
-      ville: json['ville'] as String?,
-      codePostal: json['code_postal'] as String?,
+          json['changement_mdp_obligatoire'] == true,
+      nom: json['nom']?.toString(),
+      prenom: json['prenom']?.toString(),
+      statut: json['statut']?.toString(),
+      telephone: json['telephone']?.toString(),
+      photoUrl: json['photo_url']?.toString(),
+      adresse: json['adresse']?.toString(),
+      ville: json['ville']?.toString(),
+      codePostal: json['code_postal']?.toString(),
     );
   }