Début refacto en MVVM (Login, drawer OK

em2rp/lib/view_model/user_management_view_model.dart

@@ -0,0 +1,38 @@
+import 'package:flutter/material.dart';
+import '../models/user_model.dart';
+import '../services/user_service.dart';
+
+class UserManagementViewModel extends ChangeNotifier {
+  final UserService _userService;
+  List<UserModel> _users = [];
+  bool _isLoading = false;
+
+  List<UserModel> get users => _users;
+  bool get isLoading => _isLoading;
+
+  UserManagementViewModel(this._userService);
+
+  Future<void> fetchUsers() async {
+    _isLoading = true;
+    notifyListeners();
+
+    _users = await _userService.fetchUsers();
+
+    _isLoading = false;
+    notifyListeners();
+  }
+
+  Future<void> updateUser(UserModel user) async {
+    await _userService.updateUser(user);
+    fetchUsers();
+  }
+
+  Future<void> deleteUser(String uid) async {
+    await _userService.deleteUser(uid);
+    fetchUsers();
+  }
+
+  Future<void> resetPassword(String email) async {
+    await _userService.resetPassword(email);
+  }
+}