chore: remove NotFound component from the application

web/src/app/not-found.tsx

@@ -1,63 +0,0 @@
-'use client';
-
-import { useRouter } from 'next/navigation';
-import { Button } from '@/components/ui/button';
-import { useTranslation } from 'react-i18next';
-
-export default function NotFound() {
-  const router = useRouter();
-  const { t } = useTranslation();
-
-  return (
-    <div className="min-h-screen bg-white flex items-center justify-center">
-      <div className="w-full max-w-[600px] px-4">
-        <div className="flex flex-col items-center p-6">
-          {/* 404 图标 */}
-          <div className="mb-8">
-            <div className="text-[72px] font-bold text-gray-800">404</div>
-          </div>
-
-          {/* 错误文本 */}
-          <div className="text-center mb-8">
-            <h1 className="text-2xl font-normal text-gray-800 mb-2">
-              {t('notFound.title')}
-            </h1>
-            <p className="text-base text-gray-600 max-w-[450px] mx-auto mb-8">
-              {t('notFound.description')}
-            </p>
-          </div>
-
-          {/* 按钮组 */}
-          <div className="flex gap-4 mb-6">
-            <Button
-              variant="default"
-              onClick={() => router.back()}
-              className="h-9 px-4 cursor-pointer"
-            >
-              {t('notFound.back')}
-            </Button>
-            <Button
-              variant="outline"
-              onClick={() => router.push('/home')}
-              className="h-9 px-4 cursor-pointer"
-            >
-              {t('notFound.home')}
-            </Button>
-          </div>
-
-          {/* 帮助文档链接 */}
-          <div className="text-center">
-            <p className="text-sm text-gray-600">
-              <a
-                href="https://docs.langbot.app"
-                className="text-black no-underline hover:underline"
-              >
-                {t('notFound.help')}
-              </a>
-            </p>
-          </div>
-        </div>
-      </div>
-    </div>
-  );
-}