criado o modelo city_load_model.dart a tela login_load_screen.dart e sync_unit_screen.dart

lib/models/city_load_model.dart

@@ -0,0 +1,15 @@
+class CityLoadModel{
+  int codCity;
+  String nameCityApi;
+  String nameCityFront;
+  String codState;
+  int codCityIbge;
+
+  CityLoadModel({
+    required this.codCity,
+    required this.nameCityApi,
+    required this.nameCityFront,
+    required this.codState,
+    required this.codCityIbge,
+});
+}