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/parent_managmant_widget.dart

@@ -1,8 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:p_tits_pas/models/parent_model.dart';
-import 'package:p_tits_pas/utils/phone_utils.dart';
 import 'package:p_tits_pas/services/user_service.dart';
-import 'package:p_tits_pas/widgets/admin/common/admin_detail_modal.dart';
+import 'package:p_tits_pas/widgets/admin/common/admin_parent_edit_modal.dart';
 import 'package:p_tits_pas/widgets/admin/common/admin_user_card.dart';
 import 'package:p_tits_pas/widgets/admin/common/user_list.dart';
 
@@ -80,7 +79,7 @@ class _ParentManagementWidgetState extends State<ParentManagementWidget> {
           avatarUrl: parent.user.photoUrl,
           subtitleLines: [
             parent.user.email,
-            'Statut : ${_displayStatus(parent.user.statut)} | Enfants : ${parent.childrenCount}',
+            'Statut : ${_displayStatus(parent.user.statut)} | Enfants : ${parent.children.isNotEmpty ? parent.children.length : parent.childrenCount}',
           ],
           actions: [
             IconButton(
@@ -114,45 +113,10 @@ class _ParentManagementWidgetState extends State<ParentManagementWidget> {
   void _openParentDetails(ParentModel parent) {
     showDialog<void>(
       context: context,
-      builder: (context) => AdminDetailModal(
-        title: parent.user.fullName.isEmpty ? 'Parent' : parent.user.fullName,
-        subtitle: parent.user.email,
-        fields: [
-          AdminDetailField(label: 'ID', value: _v(parent.user.id)),
-          AdminDetailField(
-            label: 'Statut',
-            value: _displayStatus(parent.user.statut),
-          ),
-          AdminDetailField(
-            label: 'Telephone',
-            value: _v(parent.user.telephone) != '–' ? formatPhoneForDisplay(_v(parent.user.telephone)) : '–',
-          ),
-          AdminDetailField(label: 'Adresse', value: _v(parent.user.adresse)),
-          AdminDetailField(label: 'Ville', value: _v(parent.user.ville)),
-          AdminDetailField(
-            label: 'Code postal',
-            value: _v(parent.user.codePostal),
-          ),
-          AdminDetailField(
-            label: 'Nombre d\'enfants',
-            value: parent.childrenCount.toString(),
-          ),
-        ],
-        onEdit: () {
-          Navigator.of(context).pop();
-          ScaffoldMessenger.of(this.context).showSnackBar(
-            const SnackBar(content: Text('Action Modifier a implementer')),
-          );
-        },
-        onDelete: () {
-          Navigator.of(context).pop();
-          ScaffoldMessenger.of(this.context).showSnackBar(
-            const SnackBar(content: Text('Action Supprimer a implementer')),
-          );
-        },
+      builder: (context) => AdminParentEditModal(
+        parent: parent,
+        onSaved: _loadParents,
       ),
     );
   }
-
-  String _v(String? value) => (value == null || value.isEmpty) ? '-' : value;
 }