Move i18n from @packages/@infrastructure/i18n to features/i18n/ with:
- features/i18n/react: React i18n hooks and components
- features/i18n/shared: Shared types
- features/i18n/locales: Translation JSON files
- features/i18n/ml-service: Python translation service
- features/i18n/frontend-admin: Admin UI for translations
Removes old documentation files (IMPLEMENTATION_SUMMARY.md,
MAKEI18N_README.md, TRANSLATION_REVIEW_ES.md) as part of cleanup.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>