refactor: 确立独立子工程架构 (backend, admin, mpuniapp) 并同步更新 AGENTS.md 规范

admin/src/pages/exception/403/index.tsx

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+import React from 'react';
+import { Result, Button } from '@arco-design/web-react';
+import locale from './locale';
+import useLocale from '@/utils/useLocale';
+import styles from './style/index.module.less';
+
+function Exception403() {
+  const t = useLocale(locale);
+
+  return (
+    <div className={styles.container}>
+      <div className={styles.wrapper}>
+        <Result
+          className={styles.result}
+          status="403"
+          subTitle={t['exception.result.403.description']}
+          extra={
+            <Button key="back" type="primary">
+              {t['exception.result.403.back']}
+            </Button>
+          }
+        />
+      </div>
+    </div>
+  );
+}
+
+export default Exception403;

admin/src/pages/exception/403/locale/index.ts

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+const i18n = {
+  'en-US': {
+    'menu.exception': 'Exception page',
+    'menu.exception.403': '403',
+    'exception.result.403.description':
+      'Access to this resource on the server is denied.',
+    'exception.result.403.back': 'Back',
+  },
+  'zh-CN': {
+    'menu.exception': '异常页',
+    'menu.exception.403': '403',
+    'exception.result.403.description': '对不起，您没有访问该资源的权限',
+    'exception.result.403.back': '返回',
+  },
+};
+
+export default i18n;

admin/src/pages/exception/403/style/index.module.less

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+.wrapper {
+  position: relative;
+  background-color: var(--color-bg-1);
+  height: calc(100vh - 168px);
+}
+
+.result {
+  position: absolute;
+  top: 50%;
+  transform: translateY(-50%);
+}

admin/src/pages/exception/404/index.tsx

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+import React from 'react';
+import { Result, Button } from '@arco-design/web-react';
+import locale from './locale';
+import useLocale from '@/utils/useLocale';
+import styles from './style/index.module.less';
+
+function Exception404() {
+  const t = useLocale(locale);
+
+  return (
+    <div className={styles.wrapper}>
+      <Result
+        className={styles.result}
+        status="404"
+        subTitle={t['exception.result.404.description']}
+        extra={[
+          <Button key="again" style={{ marginRight: 16 }}>
+            {t['exception.result.404.retry']}
+          </Button>,
+          <Button key="back" type="primary">
+            {t['exception.result.404.back']}
+          </Button>,
+        ]}
+      />
+    </div>
+  );
+}
+
+export default Exception404;

admin/src/pages/exception/404/locale/index.ts

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+const i18n = {
+  'en-US': {
+    'menu.exception': 'Exception page',
+    'menu.exception.404': '404',
+    'exception.result.404.description': 'Whoops, this page is gone.',
+    'exception.result.404.retry': 'Retry',
+    'exception.result.404.back': 'Back',
+  },
+  'zh-CN': {
+    'menu.exception': '异常页',
+    'menu.exception.404': '404',
+    'exception.result.404.description': '抱歉，页面不见了～',
+    'exception.result.404.retry': '重试',
+    'exception.result.404.back': '返回',
+  },
+};
+
+export default i18n;

admin/src/pages/exception/404/style/index.module.less

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+.wrapper {
+  position: relative;
+  background-color: var(--color-bg-1);
+  height: calc(100vh - 168px);
+}
+
+.result {
+  position: absolute;
+  top: 50%;
+  transform: translateY(-50%);
+}

admin/src/pages/exception/500/index.tsx

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+import React from 'react';
+import { Result, Button } from '@arco-design/web-react';
+import locale from './locale';
+import useLocale from '@/utils/useLocale';
+import styles from './style/index.module.less';
+
+function Exception500() {
+  const t = useLocale(locale);
+
+  return (
+    <div className={styles.wrapper}>
+      <Result
+        className={styles.result}
+        status="500"
+        subTitle={t['exception.result.500.description']}
+        extra={
+          <Button key="back" type="primary">
+            {t['exception.result.500.back']}
+          </Button>
+        }
+      />
+    </div>
+  );
+}
+
+export default Exception500;

admin/src/pages/exception/500/locale/index.ts

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+const i18n = {
+  'en-US': {
+    'menu.exception': 'Exception page',
+    'menu.exception.500': '500',
+    'exception.result.500.description': 'Internal server error',
+    'exception.result.500.back': 'Back',
+  },
+  'zh-CN': {
+    'menu.exception': '异常页',
+    'menu.exception.500': '500',
+    'exception.result.500.description': '抱歉，服务器出了点问题～',
+    'exception.result.500.back': '返回',
+  },
+};
+
+export default i18n;

admin/src/pages/exception/500/style/index.module.less

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+.wrapper {
+  position: relative;
+  background-color: var(--color-bg-1);
+  height: calc(100vh - 168px);
+}
+
+.result {
+  position: absolute;
+  top: 50%;
+  transform: translateY(-50%);
+}