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Add complete i18n infrastructure with 21 supported languages: English, Simplified Chinese, Traditional Chinese, Japanese, Korean, Spanish, French, Italian, Brazilian Portuguese, German, Dutch, Swedish, Russian, Polish, Ukrainian, Arabic (RTL), Turkish, Hindi, Vietnamese, Indonesian, and Thai. - I18nProvider context with three-tier locale detection (user preference > navigator.languages > instance default > English) - ~1500 translation keys per locale with TypeScript-enforced completeness - Dynamic code-splitting: only the active locale is loaded at runtime - Language selectors in footer, login page, settings, and mobile sidebar - Arabic RTL support with CSS logical properties across all components - Tool names, descriptions, and categories translated via i18n helpers - Public API endpoint GET /api/v1/config/locale for instance default - Multi-script font stack (CJK, Arabic, Devanagari, Thai, Cyrillic) - format() and plural() helpers for interpolation and pluralization - API error translation mapping (translateApiError) - 36 Playwright e2e tests verifying all 21 locales load correctly - 25 unit tests for format, plural, locale detection, and completeness - Updated translations.md docs and CLAUDE.md conventions