feat(studio): add i18n infrastructure with zh-CN language pack

[26wukongwudao]

Summary

Add internationalization (i18n) support to AutoGen Studio frontend using , enabling multi-language UI with a standard language pack system. This PR includes the i18n infrastructure and a complete Simplified Chinese (zh-CN) translation.

Related Issue: #7573

Changes

New Files

• • i18next initialization with localStorage persistence
• • English source language pack (143 keys)
• • Simplified Chinese language pack (143 keys)
• • Language selection dropdown (antd Select)

Modified Files

• • Import i18n initialization
• • Add i18next + react-i18next dependencies
• • Migrate navigation items to use t() translation calls
• • Add LanguageSwitcher, migrate Sign out text
• • Add antd locale support (zh_CN/en_US) via ConfigProvider

How It Works

1. i18next is initialized in gatsby-browser.js with en-US and zh-CN resource bundles
2. Language preference is read from localStorage, defaulting to en-US
3. LanguageSwitcher component in the header allows switching between languages
4. antd ConfigProvider receives the appropriate locale based on current language
5. Components use useTranslation() and t() for translatable text

Translation Key Statistics

Namespace	Keys	Description
nav	13	Navigation menu, sidebar
build	22	Team builder page
playground	16	Chat/playground page
gallery	18	Gallery page
settings	24	Settings page
deploy	12	Deploy page
labs	2	Labs page
auth	6	Authentication
common	13	Shared components
Total	143

Testing

• English UI renders identically after migration (no regressions)
• Chinese UI shows all translated text correctly
• Language switch persists across page navigation
• Language preference saved in localStorage
• antd components show Chinese text when zh-CN is selected
• Build succeeds with no TypeScript errors
• CI passes

Related

This is PR 1 of 4 in the i18n series (see #7573 for full proposal). Subsequent PRs will migrate remaining page components.

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