Add i18n support and globalization dashboard integration

[DoisLONG]

Summary

This PR adds initial internationalization support and globalization dashboard integration for GenAIStudio.

Changes

Frontend i18n support

• add i18n runtime dependencies in studio-frontend/package.json
• initialize i18n in studio-frontend/packages/ui/src/App.jsx
• update UI text handling for key workflow-related pages and components
• add/update assets used by the quick start guide

Globalization dashboard service

• add globalization-service/ for dashboard-related globalization support
• include Dockerfile, README, Python app entry, static dashboard page, and requirements

Repo hygiene

• update .gitignore to exclude local/system cache files such as:
  • .DS_Store
  • __pycache__/
  • *.pyc
  • .env.development

Notes

• this branch was rebased/cherry-picked onto the latest upstream main
• merge conflicts with upstream changes were resolved manually
• local-only files and cache artifacts were removed before opening this PR

Testing

• verified branch can be merged cleanly into upstream main
• verified frontend i18n entry is loaded from App.jsx
• verified referenced quick start guide assets are included