feat(frontend): 控制台 next-intl 中英双语

接入无 URL 前缀的 zh-CN/en，顶栏与外观设置可切换语言；选择写入 cookie 后刷新生效。

frontend/components/auth/login-page.tsx

@@ -12,6 +12,7 @@ import { Check } from 'lucide-react';
 import { AuthService } from '@/lib/services/auth';
 import { useAuth } from '@/components/providers/auth-provider';
 import { safeRedirectTarget } from '@/lib/utils';
+import { useTranslations } from 'next-intl';
 
 /**
  * 登录页面组件
@@ -27,6 +28,7 @@ export function LoginPage() {
   const router = useRouter();
   const searchParams = useSearchParams();
   const { user, loading, setUser } = useAuth();
+  const t = useTranslations('auth.login');
   const [showOTP, setShowOTP] = useState(false);
 
   /* 处理OAuth回调 */
@@ -87,9 +89,7 @@ export function LoginPage() {
         try {
           const result = await AuthService.handleCallback({ state, code });
           if (result.status === 'need_bind') {
-            toast.info(
-              '您的第三方账号未绑定本地账号，系统已关闭注册。请登录已有本地账号进行绑定。',
-            );
+            toast.info(t('needBind'));
             setIsProcessingCallback(false);
             router.replace('/login');
             return;
@@ -98,7 +98,9 @@ export function LoginPage() {
             setUser(result.user);
           }
           setLoginSuccess(true);
-          toast.success(result.status === 'bound' ? '绑定成功' : '登录成功');
+          toast.success(
+            result.status === 'bound' ? t('bindSuccess') : t('success'),
+          );
 
           setTimeout(() => {
             if (!redirectedRef.current) {
@@ -109,7 +111,7 @@ export function LoginPage() {
         } catch (error) {
           console.error('OAuth callback error:', error);
           toast.error(
-            error instanceof Error ? error.message : '登录失败，请重试',
+            error instanceof Error ? error.message : t('failed'),
           );
           setIsProcessingCallback(false);
           router.replace('/login');
@@ -117,7 +119,7 @@ export function LoginPage() {
       }
     };
     handleOAuthCallback();
-  }, [router, searchParams, setUser]);
+  }, [router, searchParams, setUser, t]);
 
   return (
     <AuthShell wide={showOTP}>
@@ -138,10 +140,10 @@ export function LoginPage() {
                   </div>
                   <div className='flex flex-col gap-2 text-center'>
                     <h3 className='font-semibold tracking-tight text-foreground'>
-                      正在检查登录状态
+                      {t('checkingSession')}
                     </h3>
                     <p className='text-xs text-muted-foreground'>
-                      请稍候，我们正在确认当前会话...
+                      {t('checkingSessionDesc')}
                     </p>
                   </div>
                 </div>
@@ -157,10 +159,10 @@ export function LoginPage() {
                   </motion.div>
                   <div className='flex flex-col gap-2 text-center'>
                     <h3 className='font-semibold tracking-tight text-foreground'>
-                      登录成功
+                      {t('success')}
                     </h3>
                     <p className='text-xs text-muted-foreground'>
-                      正在跳转至控制台...
+                      {t('redirecting')}
                     </p>
                   </div>
                 </div>
@@ -171,10 +173,10 @@ export function LoginPage() {
                   </div>
                   <div className='flex flex-col gap-2 text-center'>
                     <h3 className='font-semibold tracking-tight text-foreground'>
-                      正在验证凭据
+                      {t('verifyingCredentials')}
                     </h3>
                     <p className='text-xs text-muted-foreground'>
-                      请稍候，我们正在为您建立安全会话...
+                      {t('establishingSession')}
                     </p>
                   </div>
                 </div>