feat(dashboard-admin): connect admin dashboard to real API data (Ticket #92)

- Frontend:
  - Create UserService to handle user-related API calls (gestionnaires, parents, AMs, admins)
  - Update AdminDashboardScreen to use dynamic widgets
  - Implement dynamic management widgets:
    - GestionnaireManagementWidget
    - ParentManagementWidget
    - AssistanteMaternelleManagementWidget
    - AdminManagementWidget
  - Add data models: ParentModel, AssistanteMaternelleModel
  - Update AppUser model
  - Update ApiConfig

- Backend:
  - Update controllers (Parents, AMs, Gestionnaires, Users) to allow ADMINISTRATEUR role to list users
  - Fix: Activate endpoint GET /gestionnaires (import GestionnairesModule in UserModule)

- Docs:
  - Add note about backend fix for Gestionnaires module
  - Update .cursorrules to forbid worktrees

- Seed:
  - Add test data seed script (reset-and-seed-db.sh)

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

frontend/lib/models/user.dart

@@ -32,42 +32,30 @@ 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: id,
-      email: email,
-      role: role,
+      id: json['id'] as String,
+      email: json['email'] as String,
+      role: json['role'] as String,
       createdAt: json['cree_le'] != null
-          ? DateTime.tryParse(json['cree_le'].toString()) ?? DateTime.now()
+          ? DateTime.parse(json['cree_le'] as String)
           : (json['createdAt'] != null
-              ? DateTime.tryParse(json['createdAt'].toString()) ?? DateTime.now()
+              ? DateTime.parse(json['createdAt'] as String)
               : DateTime.now()),
       updatedAt: json['modifie_le'] != null
-          ? DateTime.tryParse(json['modifie_le'].toString()) ?? DateTime.now()
+          ? DateTime.parse(json['modifie_le'] as String)
           : (json['updatedAt'] != null
-              ? DateTime.tryParse(json['updatedAt'].toString()) ?? DateTime.now()
+              ? DateTime.parse(json['updatedAt'] as String)
               : DateTime.now()),
       changementMdpObligatoire:
-          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(),
+          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?,
     );
   }
 

frontend/lib/screens/auth/login_screen.dart

@@ -236,20 +236,20 @@ class _LoginPageState extends State<LoginScreen> with WidgetsBindingObserver {
                                   padding: const EdgeInsets.all(12),
                                   margin: const EdgeInsets.only(bottom: 15),
                                   decoration: BoxDecoration(
-                                    color: Colors.red.shade50,
+                                    color: Colors.red[50],
                                     borderRadius: BorderRadius.circular(10),
-                                    border: Border.all(color: Colors.red.shade300),
+                                    border: Border.all(color: Colors.red[300]!),
                                   ),
                                   child: Row(
                                     children: [
-                                      Icon(Icons.error_outline, color: Colors.red.shade700, size: 20),
+                                      Icon(Icons.error_outline, color: Colors.red[700], size: 20),
                                       const SizedBox(width: 10),
                                       Expanded(
                                         child: Text(
                                           _errorMessage!,
                                           style: GoogleFonts.merienda(
                                             fontSize: 12,
-                                            color: Colors.red.shade700,
+                                            color: Colors.red[700],
                                           ),
                                         ),
                                       ),

frontend/lib/services/auth_service.dart

@@ -43,8 +43,7 @@ class AuthService {
       }
     } catch (e) {
       if (e is Exception) rethrow;
-      if (e is Error) throw Exception('Erreur interne: ${e.toString()}');
-      throw Exception('Erreur réseau: impossible de se connecter au serveur ($e)');
+      throw Exception('Erreur réseau: impossible de se connecter au serveur');
     }
   }
 
@@ -57,22 +56,14 @@ class AuthService {
       );
 
       if (response.statusCode == 200) {
-        final raw = jsonDecode(response.body);
-        if (raw is! Map<String, dynamic>) {
-          throw Exception('Profil invalide: réponse serveur inattendue');
-        }
-        // Accepter réponse directe ou wrapper { data: {...} }
-        final data = raw.containsKey('data') && raw['data'] is Map<String, dynamic>
-            ? raw['data'] as Map<String, dynamic>
-            : raw;
+        final data = jsonDecode(response.body);
         return AppUser.fromJson(data);
       } else {
         throw Exception('Erreur lors de la récupération du profil');
       }
     } catch (e) {
       if (e is Exception) rethrow;
-      if (e is Error) throw Exception('Erreur interne: ${e.toString()}');
-      throw Exception('Erreur réseau: impossible de récupérer le profil ($e)');
+      throw Exception('Erreur réseau: impossible de récupérer le profil');
     }
   }
 
@@ -107,8 +98,7 @@ class AuthService {
       await _saveCurrentUser(user);
     } catch (e) {
       if (e is Exception) rethrow;
-      if (e is Error) throw Exception('Erreur interne: ${e.toString()}');
-      throw Exception('Erreur réseau: impossible de changer le mot de passe ($e)');
+      throw Exception('Erreur réseau: impossible de changer le mot de passe');
     }
   }