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/models/assistante_maternelle_model.dart

@@ -1,30 +1,102 @@
+import 'package:p_tits_pas/models/parent_child_summary.dart';
 import 'package:p_tits_pas/models/user.dart';
 
 class AssistanteMaternelleModel {
   final AppUser user;
   final String? approvalNumber;
+  final String? nir;
   final String? residenceCity;
   final int? maxChildren;
   final int? placesAvailable;
+  final String? biography;
+  final bool? available;
+  final String? agreementDate;
+  final List<ParentChildSummary> children;
 
   AssistanteMaternelleModel({
     required this.user,
     this.approvalNumber,
+    this.nir,
     this.residenceCity,
     this.maxChildren,
     this.placesAvailable,
+    this.biography,
+    this.available,
+    this.agreementDate,
+    this.children = const [],
   });
 
   factory AssistanteMaternelleModel.fromJson(Map<String, dynamic> json) {
-    final userJson = json['user'] ?? json;
+    final root = Map<String, dynamic>.from(json);
+    final userJson = Map<String, dynamic>.from(root['user'] ?? root);
+    if (root['numero_dossier'] != null && userJson['numero_dossier'] == null) {
+      userJson['numero_dossier'] = root['numero_dossier'];
+    }
     final user = AppUser.fromJson(userJson);
-    
+    final children = _parseChildren(root);
+
     return AssistanteMaternelleModel(
       user: user,
-      approvalNumber: json['numero_agrement'] as String?,
-      residenceCity: json['ville_residence'] as String?,
-      maxChildren: json['nb_max_enfants'] as int?,
-      placesAvailable: json['place_disponible'] as int?,
+      approvalNumber: _str(
+        root['approval_number'] ?? root['numero_agrement'],
+      ),
+      nir: _str(root['nir'] ?? root['nir_chiffre']),
+      residenceCity: _str(
+        root['residence_city'] ?? root['ville_residence'],
+      ),
+      maxChildren: _int(root['max_children'] ?? root['nb_max_enfants']),
+      placesAvailable: _int(
+        root['places_available'] ?? root['place_disponible'],
+      ),
+      biography: _str(root['biography'] ?? root['biographie']),
+      available: root['available'] as bool? ?? root['disponible'] as bool?,
+      agreementDate: _dateString(
+        root['agreement_date'] ?? root['date_agrement'],
+      ),
+      children: children,
     );
   }
+
+  static String? _str(dynamic v) {
+    if (v == null) return null;
+    final s = v.toString().trim();
+    return s.isEmpty ? null : s;
+  }
+
+  static int? _int(dynamic v) {
+    if (v == null) return null;
+    if (v is int) return v;
+    return int.tryParse(v.toString());
+  }
+
+  static String? _dateString(dynamic v) {
+    if (v == null) return null;
+    return v.toString().split('T').first;
+  }
+
+  static List<ParentChildSummary> _parseChildren(Map<String, dynamic> json) {
+    final children = <ParentChildSummary>[];
+    final seen = <String>{};
+
+    void add(ParentChildSummary? child) {
+      if (child == null || child.id.isEmpty || seen.contains(child.id)) return;
+      seen.add(child.id);
+      children.add(child);
+    }
+
+    final links = json['amChildren'] ??
+        json['am_children'] ??
+        json['assistanteChildren'] ??
+        json['assistante_children'];
+    if (links is List) {
+      for (final link in links) {
+        if (link is! Map) continue;
+        add(ParentChildSummary.fromParentChildLink(
+          Map<String, dynamic>.from(link),
+        ));
+      }
+    }
+
+    return children;
+  }
 }