update api

lib/features/auth/data/models/login_dto.dart

@@ -0,0 +1,18 @@
+/// Login request Data Transfer Object
+class LoginDto {
+  final String email;
+  final String password;
+
+  const LoginDto({
+    required this.email,
+    required this.password,
+  });
+
+  /// Convert to JSON for API request
+  Map<String, dynamic> toJson() {
+    return {
+      'email': email,
+      'password': password,
+    };
+  }
+}