♻️ 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/hooks/channels/useChannelsData.jsx

@@ -26,10 +26,10 @@ import {
   showSuccess,
   loadChannelModels,
   copy
-} from '../../helpers/index.js';
-import { CHANNEL_OPTIONS, ITEMS_PER_PAGE, MODEL_TABLE_PAGE_SIZE } from '../../constants/index.js';
-import { useIsMobile } from '../common/useIsMobile.js';
-import { useTableCompactMode } from '../common/useTableCompactMode.js';
+} from '../../helpers';
+import { CHANNEL_OPTIONS, ITEMS_PER_PAGE, MODEL_TABLE_PAGE_SIZE } from '../../constants';
+import { useIsMobile } from '../common/useIsMobile';
+import { useTableCompactMode } from '../common/useTableCompactMode';
 import { Modal } from '@douyinfe/semi-ui';
 
 export const useChannelsData = () => {