♻️ refactor(web): migrate React modules from .js to .jsx and align entrypoint

- Rename React components/pages/utilities that contain JSX to `.jsx` across `web/src`
- Update import paths and re-exports to match new `.jsx` extensions
- Fix Vite entry by switching `web/index.html` from `/src/index.js` to `/src/index.jsx`
- Verified remaining `.js` files are plain JS (hooks/helpers/constants) and do not require JSX
- No runtime behavior changes; extension and reference alignment only

Context: Resolves the Vite pre-transform error caused by the stale `/src/index.js` entry after migrating to `.jsx`.

web/src/components/auth/OAuth2Callback.jsx

@@ -0,0 +1,89 @@
+/*
+Copyright (C) 2025 QuantumNous
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+For commercial licensing, please contact support@quantumnous.com
+*/
+
+import React, { useContext, useEffect } from 'react';
+import { useNavigate, useSearchParams } from 'react-router-dom';
+import { useTranslation } from 'react-i18next';
+import { API, showError, showSuccess, updateAPI, setUserData } from '../../helpers';
+import { UserContext } from '../../context/User';
+import Loading from '../common/ui/Loading';
+
+const OAuth2Callback = (props) => {
+  const { t } = useTranslation();
+  const [searchParams] = useSearchParams();
+  const [, userDispatch] = useContext(UserContext);
+  const navigate = useNavigate();
+
+  // 最大重试次数
+  const MAX_RETRIES = 3;
+
+  const sendCode = async (code, state, retry = 0) => {
+    try {
+      const { data: resData } = await API.get(
+        `/api/oauth/${props.type}?code=${code}&state=${state}`,
+      );
+
+      const { success, message, data } = resData;
+
+      if (!success) {
+        throw new Error(message || 'OAuth2 callback error');
+      }
+
+      if (message === 'bind') {
+        showSuccess(t('绑定成功！'));
+        navigate('/console/personal');
+      } else {
+        userDispatch({ type: 'login', payload: data });
+        localStorage.setItem('user', JSON.stringify(data));
+        setUserData(data);
+        updateAPI();
+        showSuccess(t('登录成功！'));
+        navigate('/console/token');
+      }
+    } catch (error) {
+      if (retry < MAX_RETRIES) {
+        // 递增的退避等待
+        await new Promise((resolve) => setTimeout(resolve, (retry + 1) * 2000));
+        return sendCode(code, state, retry + 1);
+      }
+
+      // 重试次数耗尽，提示错误并返回设置页面
+      showError(error.message || t('授权失败'));
+      navigate('/console/personal');
+    }
+  };
+
+  useEffect(() => {
+    const code = searchParams.get('code');
+    const state = searchParams.get('state');
+
+    // 参数缺失直接返回
+    if (!code) {
+      showError(t('未获取到授权码'));
+      navigate('/console/personal');
+      return;
+    }
+
+    sendCode(code, state);
+  }, []);
+
+  return <Loading />;
+};
+
+export default OAuth2Callback;