feat(dependencies): add rxdart package and improve string extension methods for better handling of empty strings and gender parsing

test/features/auth/models/yandex_profile_model_test.dart

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+import 'package:eatvio_app/features/auth/models/yandex_profile_model.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('YandexProfileModel', () {
+    test('создает YandexProfileModel с правильными значениями', () {
+      final phoneData = YandexPhoneData(id: 1, number: '+79001234567');
+      final model = YandexProfileModel(
+        id: '123',
+        login: 'test@yandex.ru',
+        birthday: '1990-01-01',
+        clientId: 'client-123',
+        displayName: 'Display Name',
+        realName: 'Real Name',
+        firstName: 'First',
+        lastName: 'Last',
+        sex: 'male',
+        defaultEmail: 'test@yandex.ru',
+        defaultPhone: phoneData,
+      );
+
+      expect(model.id, '123');
+      expect(model.login, 'test@yandex.ru');
+      expect(model.defaultPhone.number, '+79001234567');
+    });
+  });
+
+  group('YandexPhoneData', () {
+    test('создает YandexPhoneData с правильными значениями', () {
+      final phoneData = YandexPhoneData(id: 1, number: '+79001234567');
+
+      expect(phoneData.id, 1);
+      expect(phoneData.number, '+79001234567');
+    });
+  });
+}
+