Merge branch 'main' into feature/windows

client/lib/widgets/auth_screen.dart

@@ -8,17 +8,14 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../l10n/app_text.dart';
 import '../pangolin_theme.dart';
+import '../services/api_config.dart';
 import '../services/auth_api.dart';
 import '../state/auth_provider.dart';
 import 'pangolin_button.dart';
 import 'pangolin_icons.dart';
 import 'pangolin_logo.dart';
 
-// API base URL（由 --dart-define 注入）
-const _kApiUrl = String.fromEnvironment(
-  'PANGOLIN_API_URL',
-  defaultValue: 'http://localhost:8080',
-);
+// API base URL 统一用 api_config.dart 的 kApiBaseUrl(单一来源,勿再重复声明)。
 
 const _easeOut = Cubic(0.22, 1, 0.36, 1);
 
@@ -55,7 +52,7 @@ class _AuthScreenState extends ConsumerState<AuthScreen>
     duration: const Duration(milliseconds: 620),
   );
 
-  late final AuthApi _api = AuthApi(baseUrl: _kApiUrl);
+  late final AuthApi _api = AuthApi(baseUrl: kApiBaseUrl);
 
   bool get _emailValid => RegExp(r'\S+@\S+\.\S+').hasMatch(_email.text);