refactor: 移除前端 Mock API，新增共享组件，优化认证流程

- 删除 mock_api_client、mock_calendar_service、mock_history_service
- 新增 fixed_length_code_input、link_button、message_composer 共享组件
- 优化登录/注册/密码重置页面使用新组件
- 简化 injection.dart 移除 mock 分支
- 更新 env.dart 配置（BACKEND_URL 替换 API_URL）
- 后端 agentscope 工具和测试更新
- 重构 AGENTS.md 文档结构
- 新增 deploy/ 目录和 protocol 文档

apps/lib/features/auth/ui/screens/login_screen.dart

@@ -6,6 +6,7 @@ import '../../../../core/theme/design_tokens.dart';
 import '../../../../core/di/injection.dart';
 import '../../../../shared/widgets/app_button.dart';
 import '../../../../shared/widgets/banner/app_banner.dart';
+import '../../../../shared/widgets/link_button.dart';
 import '../../../../shared/widgets/toast/toast_type.dart';
 import '../widgets/auth_page_scaffold.dart';
 import '../../presentation/cubits/login_cubit.dart';
@@ -225,30 +226,16 @@ class _LoginViewState extends State<LoginView> {
   }
 
   Widget _buildForgotPassword() {
-    return GestureDetector(
+    return LinkButton(
+      text: '忘记密码？',
       onTap: () => context.push('/reset-password'),
-      child: const Text(
-        '忘记密码？',
-        style: TextStyle(
-          fontSize: 14,
-          fontWeight: FontWeight.w500,
-          color: AppColors.slate500,
-        ),
-      ),
     );
   }
 
   Widget _buildFooter() {
-    return GestureDetector(
+    return LinkButton(
+      text: '还没有账号？去注册',
       onTap: () => context.push('/register'),
-      child: const Text(
-        '还没有账号？去注册',
-        style: TextStyle(
-          fontSize: 14,
-          fontWeight: FontWeight.w500,
-          color: AppColors.slate500,
-        ),
-      ),
     );
   }
 }