feat(#131): fiches parent/AM éditable, placement AM↔enfant, statuts garde/sans_garde

Squash merge develop → master.

- Fiche parent éditable (co-parent, PATCH fiche, GET /parents)
- Fiche AM 3 onglets (PATCH fiche, rattacher/détacher enfants)
- Table enfants_assistantes_maternelles + enum garde/sans_garde
- Migration SQL + BDD.sql canonique
- Correctifs recette : @Get() parents, DTO fiche AM, fix NIR

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

frontend/lib/widgets/admin/validation_am_wizard.dart

@@ -1,13 +1,13 @@
 import 'package:flutter/material.dart';
 import 'package:p_tits_pas/models/dossier_unifie.dart';
 import 'package:p_tits_pas/utils/date_display_utils.dart';
-import 'package:p_tits_pas/utils/phone_utils.dart';
 import 'package:p_tits_pas/utils/nir_utils.dart';
 import 'package:p_tits_pas/models/user.dart';
 import 'package:p_tits_pas/services/user_service.dart';
 import 'package:p_tits_pas/services/api/api_config.dart';
 import 'package:p_tits_pas/widgets/admin/common/admin_detail_modal.dart';
 import 'package:p_tits_pas/widgets/admin/common/validation_detail_section.dart';
+import 'package:p_tits_pas/widgets/common/identity_block.dart';
 import 'package:p_tits_pas/widgets/common/auth_network_image.dart';
 import 'validation_modal_theme.dart';
 import 'validation_refus_form.dart';
@@ -60,21 +60,6 @@ class _ValidationAmWizardState extends State<ValidationAmWizard> {
 
   void _emitStep() => widget.onStepChanged?.call(_step, _stepCount);
 
-  /// Même ordre et disposition que le formulaire de création de compte (Nom/Prénom, Tél/Email, Adresse, CP/Ville).
-  List<AdminDetailField> _personalFields(AppUser u) => [
-        AdminDetailField(label: 'Nom', value: _v(u.nom)),
-        AdminDetailField(label: 'Prénom', value: _v(u.prenom)),
-        AdminDetailField(
-            label: 'Téléphone',
-            value: _v(u.telephone) != '–'
-                ? formatPhoneForDisplay(_v(u.telephone))
-                : '–'),
-        AdminDetailField(label: 'Email', value: _v(u.email)),
-        AdminDetailField(label: 'Adresse (N° et Rue)', value: _v(u.adresse)),
-        AdminDetailField(label: 'Code postal', value: _v(u.codePostal)),
-        AdminDetailField(label: 'Ville', value: _v(u.ville)),
-      ];
-
   /// Panneau photo + grille droite : NIR|naissance, ville|pays, agrément|date, capa|places.
   List<AdminDetailField> _photoProFields(DossierAM d) {
     final u = d.user;
@@ -110,10 +95,7 @@ class _ValidationAmWizardState extends State<ValidationAmWizard> {
     ];
   }
 
-  static const List<int> _personalRowLayout = [2, 2, 1, 2];
-  static const Map<int, List<int>> _personalRowFlex = {
-    3: [2, 5]
-  }; // Code postal étroit, Ville large
+  static const List<int> _photoProRowLayout = [2, 2, 2, 2];
 
   /// Proportion photo d’identité (35×45 mm).
   static const double _idPhotoAspectRatio = 35 / 45;
@@ -266,11 +248,10 @@ class _ValidationAmWizardState extends State<ValidationAmWizard> {
             return SingleChildScrollView(
               child: ConstrainedBox(
                 constraints: BoxConstraints(minWidth: constraints.maxWidth),
-                child: ValidationDetailSection(
+                child: IdentityBlock.readOnlyFromUser(
+                  u,
                   title: 'Identité et coordonnées',
-                  fields: _personalFields(u),
-                  rowLayout: _personalRowLayout,
-                  rowFlex: _personalRowFlex,
+                  emptyLabel: '–',
                 ),
               ),
             );
@@ -311,7 +292,7 @@ class _ValidationAmWizardState extends State<ValidationAmWizard> {
                           child: ValidationDetailSection(
                             title: 'Dossier professionnel',
                             fields: _photoProFields(d),
-                            rowLayout: const [2, 2, 2, 2],
+                            rowLayout: _photoProRowLayout,
                           ),
                         ),
                       );