feat(#152/#155): cleanup est_multiple + dashboard sans préfixe Admin (squash develop).

Suppression complète grossesse multiple / est_multiple (BDD, API, front).
Rename option C : widgets partagés et panels staff sous widgets/dashboard/,
AdminManagementWidget seul restant dans widgets/admin/.

frontend/lib/widgets/dashboard/validation_family_wizard.dart

@@ -0,0 +1,29 @@
+import 'package:flutter/material.dart';
+import 'package:p_tits_pas/models/dossier_unifie.dart';
+import 'package:p_tits_pas/widgets/dashboard/parent_dossier_wizard.dart';
+
+/// Wrapper historique (#107) — délègue à [ParentDossierWizard.review].
+class ValidationFamilyWizard extends StatelessWidget {
+  final DossierFamille dossier;
+  final VoidCallback onClose;
+  final VoidCallback onSuccess;
+  final void Function(int step, int total)? onStepChanged;
+
+  const ValidationFamilyWizard({
+    super.key,
+    required this.dossier,
+    required this.onClose,
+    required this.onSuccess,
+    this.onStepChanged,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return ParentDossierWizard.review(
+      dossier: dossier,
+      onClose: onClose,
+      onSuccess: onSuccess,
+      onStepChanged: onStepChanged,
+    );
+  }
+}