Add frontend internationalization support

[frankwei98]

Summary

• Add i18n infrastructure for locales
  • English
  • Chinese
  • Japanese
  • Korean
  • French
  • Spanish
• Localize configuration, modem, forwarding, messaging, login, and shared UI components
• Add typed translation resources and test setup
• Update frontend dependencies and Vite configuration

Testing

• Add and update i18n, configuration editor, and modem status panel tests
• Validate frontend behavior with the updated Vitest setup

Summary by CodeRabbit

• New Features

  • Added multilingual support across the application.
  • Added a language selector with English, Chinese, Japanese, Korean, French, and Spanish options.
  • Localized navigation, configuration, messaging, modem, forwarding, login, accessibility labels, and dialogs.

• Tests

  • Added coverage for language switching, translation behavior, persistence, interpolation, pluralization, and translation completeness.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/frontend-i18n-foundation

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