feat: add arch

lib/data/services/auth_service.dart

@@ -0,0 +1,12 @@
+class AuthService {
+  Future<Map<String, dynamic>> login(String email, String password) async {
+    // شبیه‌سازی API Call
+    await Future.delayed(const Duration(seconds: 2));
+
+    if (email == 'test@example.com' && password == 'password123') {
+      return {'token': 'xyz123', 'name': 'John Doe'};
+    } else {
+      throw Exception('Invalid credentials');
+    }
+  }
+}