phsl / new-api

This commit introduces the following changes:

- Add i18n support to the Loading component
- Import useTranslation hook from react-i18next
- Replace hardcoded Chinese text with translation keys
- Support dynamic content interpolation for loading prompts
- Use {{name}} variable in translation template

Technical details:
- Added: import { useTranslation } from 'react-i18next'
- Modified: Loading text from static Chinese to i18n keys
- Translation keys added:
  - "加载中..."
  - "加载{{name}}中..."

File changed: web/src/components/Loading.js