feat(#138,#143,#144): fiche enfant admin, consentement photo et fix gestionnaire.

Squash merge develop → master.
- #138 : modale enfant paysage, zone AM/scolarisation, liens responsables
- #144 : persistance consent_photo à l'inscription enfant
- #143 : masquer Supprimer sur la propre fiche gestionnaire

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

frontend/lib/models/enfant_admin_model.dart

@@ -37,6 +37,34 @@ class EnfantAdminModel {
     return '$fn $ln';
   }
 
+  EnfantAdminModel copyWith({
+    String? id,
+    String? firstName,
+    String? lastName,
+    String? gender,
+    String? birthDate,
+    String? dueDate,
+    String? status,
+    String? photoUrl,
+    bool? consentPhoto,
+    bool? isMultiple,
+    List<EnfantParentLink>? parentLinks,
+  }) {
+    return EnfantAdminModel(
+      id: id ?? this.id,
+      firstName: firstName ?? this.firstName,
+      lastName: lastName ?? this.lastName,
+      gender: gender ?? this.gender,
+      birthDate: birthDate ?? this.birthDate,
+      dueDate: dueDate ?? this.dueDate,
+      status: status ?? this.status,
+      photoUrl: photoUrl ?? this.photoUrl,
+      consentPhoto: consentPhoto ?? this.consentPhoto,
+      isMultiple: isMultiple ?? this.isMultiple,
+      parentLinks: parentLinks ?? this.parentLinks,
+    );
+  }
+
   factory EnfantAdminModel.fromJson(Map<String, dynamic> json) {
     final linksRaw = json['parentLinks'] as List?;
     final links = <EnfantParentLink>[];
@@ -48,17 +76,25 @@ class EnfantAdminModel {
       }
     }
 
+    final photoUrl = json['photo_url'] as String? ?? json['photoUrl'] as String?;
+    final consentPhoto = _parseBool(json['consent_photo']) ||
+        _parseBool(json['consentement_photo']) ||
+        _parseBool(json['consentPhoto']);
+
     return EnfantAdminModel(
       id: (json['id'] ?? '').toString(),
-      firstName: json['first_name'] as String?,
-      lastName: json['last_name'] as String?,
-      gender: json['gender'] as String?,
-      birthDate: _dateString(json['birth_date']),
-      dueDate: _dateString(json['due_date']),
-      status: normalizeEnfantStatus(json['status']?.toString()),
-      photoUrl: json['photo_url'] as String?,
-      consentPhoto: json['consent_photo'] == true,
-      isMultiple: json['is_multiple'] == true,
+      firstName: json['first_name'] as String? ?? json['prenom'] as String?,
+      lastName: json['last_name'] as String? ?? json['nom'] as String?,
+      gender: json['gender'] as String? ?? json['genre'] as String?,
+      birthDate: _dateString(json['birth_date'] ?? json['date_naissance']),
+      dueDate: _dateString(json['due_date'] ?? json['date_prevue_naissance']),
+      status: normalizeEnfantStatus(
+        (json['status'] ?? json['statut'])?.toString(),
+      ),
+      photoUrl: photoUrl,
+      consentPhoto: consentPhoto,
+      isMultiple: _parseBool(json['is_multiple']) ||
+          _parseBool(json['est_multiple']),
       parentLinks: links,
     );
   }
@@ -76,6 +112,15 @@ class EnfantAdminModel {
     };
   }
 
+  static bool _parseBool(dynamic value) {
+    if (value == true || value == 1) return true;
+    if (value is String) {
+      final s = value.trim().toLowerCase();
+      return s == 'true' || s == '1' || s == 't' || s == 'yes';
+    }
+    return false;
+  }
+
   static String? _dateString(dynamic v) {
     if (v == null) return null;
     if (v is String) return v.split('T').first;
@@ -89,6 +134,13 @@ class EnfantParentLink {
 
   EnfantParentLink({required this.parentId, this.parentName});
 
+  EnfantParentLink copyWith({String? parentId, String? parentName}) {
+    return EnfantParentLink(
+      parentId: parentId ?? this.parentId,
+      parentName: parentName ?? this.parentName,
+    );
+  }
+
   factory EnfantParentLink.fromJson(Map<String, dynamic> json) {
     final parentId =
         (json['parentId'] ?? json['id_parent'] ?? '').toString();
@@ -99,6 +151,12 @@ class EnfantParentLink {
       if (user is Map<String, dynamic>) {
         final u = AppUser.fromJson(user);
         name = u.fullName.isNotEmpty ? u.fullName : u.email;
+      } else {
+        // Parfois le parent est aplati (prenom/nom) sans nested user.
+        final prenom = (parent['prenom'] ?? parent['first_name'] ?? '').toString().trim();
+        final nom = (parent['nom'] ?? parent['last_name'] ?? '').toString().trim();
+        final flat = '$prenom $nom'.trim();
+        if (flat.isNotEmpty) name = flat;
       }
     }
     return EnfantParentLink(