- Goal:
Add new localization (i18n) to my website using the Internationalization plugin of Umi Max so that users can switch between Vietnamese and English.

- Tasks for you:

1. Create full base setup for i18n in Umi Max, including:

    + Required configuration in config/config.ts

    + Folder structure for locales

    + Base translation files (vi-VN.ts, en-US.ts)

    + Any needed runtime or app-level configuration

2. Provide sample code for:

    + Using i18n inside components (useIntl, <FormattedMessage />, etc.)

    + Creating a language switcher component

3. Write a clear usage guide explaining:

    + Where to place all files

    + How to import and use translations

    + How to switch languages at runtime

Make sure all examples are valid for Umi Max (Umi 4.5.0). Checked task you complete