feat(auth): transition from email to phone-based OTP authentication

- Replace Email+Password login with Phone+OTP flow
- Remove RegisterCubit and registration screens (email verification)
- Remove ResetPasswordCubit and reset password screens
- Add phone normalization and international dial code support
- Update LoginCubit with sendCode/resend cooldown logic
- Add new widgets: phone prefix selector, confirm sheet
- Update all auth API endpoints: /otp/send, /phone-session
- Update form inputs: Email -> Phone with E.164 validation
- Update tests for new auth flow

apps/lib/core/form_inputs/form_inputs.dart

@@ -13,16 +13,17 @@ class Username extends FormzInput<String, String> {
   }
 }
 
-class Email extends FormzInput<String, String> {
-  const Email.pure() : super.pure('');
-  const Email.dirty([super.value = '']) : super.dirty();
+class Phone extends FormzInput<String, String> {
+  const Phone.pure() : super.pure('');
+  const Phone.dirty([super.value = '']) : super.dirty();
 
-  static final _regex = RegExp(r'^[\w.-]+@[\w.-]+\.\w+$');
+  static final _regex = RegExp(r'^\d{7,14}$');
 
   @override
   String? validator(String value) {
-    if (value.isEmpty) return '请输入邮箱';
-    if (!_regex.hasMatch(value)) return '邮箱格式不正确';
+    final normalized = value.replaceAll(RegExp(r'\s+'), '');
+    if (normalized.isEmpty) return '请输入手机号';
+    if (!_regex.hasMatch(normalized)) return '手机号格式不正确';
     return null;
   }
 }

apps/lib/core/router/app_router.dart

@@ -4,11 +4,8 @@ import '../../features/auth/presentation/bloc/auth_bloc.dart';
 import '../../features/auth/presentation/bloc/auth_state.dart';
 import 'app_routes.dart';
 import 'go_router_refresh_stream.dart';
-import '../../features/auth/ui/screens/login_screen.dart';
 import '../../features/auth/ui/screens/auth_boot_screen.dart';
-import '../../features/auth/ui/screens/register_screen.dart';
-import '../../features/auth/ui/screens/register_verification_screen.dart';
-import '../../features/auth/ui/screens/reset_password_screen.dart';
+import '../../features/auth/ui/screens/login_screen.dart';
 import '../../features/home/ui/screens/home_screen.dart';
 import '../../features/messages/ui/screens/message_invite_list_screen.dart';
 import '../../features/messages/ui/screens/message_invite_detail_screen.dart';
@@ -28,7 +25,6 @@ import '../../features/settings/ui/screens/settings_screen.dart';
 import '../../features/settings/ui/screens/features_screen.dart';
 import '../../features/settings/ui/screens/memory_screen.dart';
 import '../../features/settings/ui/screens/account_screen.dart';
-import '../../features/settings/ui/screens/change_password_screen.dart';
 import '../../features/settings/ui/screens/edit_profile_screen.dart';
 
 final _protectedRoutes = [
@@ -43,7 +39,6 @@ final _protectedRoutes = [
   AppRoutes.settingsFeatures,
   AppRoutes.settingsMemory,
   AppRoutes.settingsAccount,
-  AppRoutes.settingsChangePassword,
   AppRoutes.settingsEditProfile,
   AppRoutes.messageInviteList,
 ];
@@ -61,8 +56,7 @@ GoRouter createAppRouter(AuthBloc authBloc) {
       final isBootRoute = state.matchedLocation == AppRoutes.authBoot;
       final isAuthRoute =
           state.matchedLocation == AppRoutes.authLogin ||
-          state.matchedLocation.startsWith('/login') ||
-          state.matchedLocation.startsWith('/register');
+          state.matchedLocation.startsWith('/login');
       final isProtected = _protectedRoutes.any(
         (route) => state.matchedLocation.startsWith(route),
       );
@@ -86,10 +80,6 @@ GoRouter createAppRouter(AuthBloc authBloc) {
         path: AppRoutes.authBoot,
         builder: (context, state) => const AuthBootScreen(),
       ),
-      GoRoute(
-        path: AppRoutes.authLogin,
-        builder: (context, state) => const LoginScreen(),
-      ),
       GoRoute(
         path: AppRoutes.calendarEventCreate,
         builder: (context, state) => CalendarEventCreateScreen(
@@ -112,16 +102,8 @@ GoRouter createAppRouter(AuthBloc authBloc) {
             CalendarEventShareScreen(eventId: state.pathParameters['id']!),
       ),
       GoRoute(
-        path: AppRoutes.authRegister,
-        builder: (context, state) => const RegisterScreen(),
-      ),
-      GoRoute(
-        path: AppRoutes.authRegisterVerification,
-        builder: (context, state) => const RegisterVerificationScreen(),
-      ),
-      GoRoute(
-        path: AppRoutes.authResetPassword,
-        builder: (context, state) => const ResetPasswordScreen(),
+        path: AppRoutes.authLogin,
+        builder: (context, state) => const LoginScreen(),
       ),
       GoRoute(
         path: AppRoutes.homeMain,
@@ -196,10 +178,6 @@ GoRouter createAppRouter(AuthBloc authBloc) {
         path: AppRoutes.settingsAccount,
         builder: (context, state) => const AccountScreen(),
       ),
-      GoRoute(
-        path: AppRoutes.settingsChangePassword,
-        builder: (context, state) => const ChangePasswordScreen(),
-      ),
       GoRoute(
         path: AppRoutes.settingsEditProfile,
         builder: (context, state) => const EditProfileScreen(),

apps/lib/core/router/app_routes.dart

@@ -3,9 +3,6 @@ class AppRoutes {
 
   static const authBoot = '/boot';
   static const authLogin = '/';
-  static const authRegister = '/register';
-  static const authRegisterVerification = '/register/verification';
-  static const authResetPassword = '/reset-password';
 
   static const homeMain = '/home';
 
@@ -31,6 +28,5 @@ class AppRoutes {
   static const settingsFeatures = '/settings/features';
   static const settingsMemory = '/settings/memory';
   static const settingsAccount = '/settings/account';
-  static const settingsChangePassword = '/change-password';
   static const settingsEditProfile = '/edit-profile';
 }