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/register_screen.dart

@@ -8,6 +8,8 @@ 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/fixed_length_code_input.dart';
+import '../../../../shared/widgets/link_button.dart';
 import '../../../../shared/widgets/toast/toast.dart';
 import '../../../../shared/widgets/toast/toast_type.dart';
 import '../../presentation/cubits/register_cubit.dart';
@@ -34,6 +36,41 @@ class RegisterView extends StatefulWidget {
 }
 
 class _RegisterViewState extends State<RegisterView> {
+  static const _inviteCodeLength = 4;
+  static const _inviteAllowedChars = <String>{
+    'A',
+    'B',
+    'C',
+    'D',
+    'E',
+    'F',
+    'G',
+    'H',
+    'J',
+    'K',
+    'M',
+    'N',
+    'P',
+    'Q',
+    'R',
+    'S',
+    'T',
+    'U',
+    'V',
+    'W',
+    'X',
+    'Y',
+    'Z',
+    '2',
+    '3',
+    '4',
+    '5',
+    '6',
+    '7',
+    '8',
+    '9',
+  };
+
   final _nicknameController = TextEditingController();
   final _emailController = TextEditingController();
   final _passwordController = TextEditingController();
@@ -51,10 +88,15 @@ class _RegisterViewState extends State<RegisterView> {
 
   Future<void> _handleNext() async {
     final cubit = context.read<RegisterCubit>();
+    final inviteCode = _inviteCodeController.text.trim().toUpperCase();
+    final normalizedInviteCode = inviteCode.length == _inviteCodeLength
+        ? inviteCode
+        : '';
+
     cubit.usernameChanged(_nicknameController.text);
     cubit.emailChanged(_emailController.text);
     cubit.passwordChanged(_passwordController.text);
-    cubit.inviteCodeChanged(_inviteCodeController.text);
+    cubit.inviteCodeChanged(normalizedInviteCode);
 
     if (!cubit.state.isStep1Valid || cubit.state.isSending) {
       String? errorMsg;
@@ -71,6 +113,14 @@ class _RegisterViewState extends State<RegisterView> {
       return;
     }
 
+    if (inviteCode.isNotEmpty && normalizedInviteCode.isEmpty && mounted) {
+      Toast.show(
+        context,
+        '邀请码需为 4 位，且仅支持 A-H/J-N/P-Z 与 2-9；已按无邀请码继续注册',
+        type: ToastType.warning,
+      );
+    }
+
     if (mounted) {
       context.push('/register/verification', extra: cubit);
     }
@@ -147,7 +197,7 @@ class _RegisterViewState extends State<RegisterView> {
               const SizedBox(height: 12),
               _buildPasswordInput(),
               const SizedBox(height: 12),
-              _buildInput('邀请码（选填）', '请输入邀请码', _inviteCodeController),
+              _buildInviteCodeInput(),
               const SizedBox(height: 12),
               _buildStepIndicator(),
               if (state.errorMessage != null)
@@ -174,6 +224,42 @@ class _RegisterViewState extends State<RegisterView> {
     );
   }
 
+  Widget _buildInviteCodeInput() {
+    return Column(
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        const Text(
+          '邀请码（选填）',
+          style: TextStyle(
+            fontSize: 13,
+            fontWeight: FontWeight.w500,
+            color: AppColors.slate600,
+          ),
+        ),
+        const SizedBox(height: 6),
+        FixedLengthCodeInput(
+          controller: _inviteCodeController,
+          length: _inviteCodeLength,
+          semanticLabel: '邀请码输入框',
+          uppercase: true,
+          allowedCharacters: _inviteAllowedChars,
+          onChanged: (value) {
+            context.read<RegisterCubit>().inviteCodeChanged(value);
+          },
+        ),
+        const SizedBox(height: 6),
+        const Text(
+          '4 位邀请码，支持 A-H/J-N/P-Z 与 2-9',
+          style: TextStyle(
+            fontSize: 12,
+            fontWeight: FontWeight.w400,
+            color: AppColors.slate500,
+          ),
+        ),
+      ],
+    );
+  }
+
   Widget _buildInput(
     String label,
     String hint,
@@ -262,16 +348,6 @@ class _RegisterViewState extends State<RegisterView> {
   }
 
   Widget _buildFooter() {
-    return GestureDetector(
-      onTap: () => context.pop(),
-      child: const Text(
-        '已有账号？去登录',
-        style: TextStyle(
-          fontSize: 14,
-          fontWeight: FontWeight.w500,
-          color: AppColors.slate500,
-        ),
-      ),
-    );
+    return LinkButton(text: '已有账号？去登录', onTap: () => context.pop());
   }
 }