feat(i18n): add pt-BR support and extract hardcoded strings

[R-Hart80]

Summary

• Add pt (Brazilian Portuguese) locale to SUPPORTED_LOCALES in lib/i18n/request.ts
• Expand messages/en.json with new keys: nav, projects, connection, language, auth
• Add messages/pt.json with full pt-BR translations for all namespaces
• Migrate header.tsx, user-menu.tsx, ConnectionStatus.tsx and app/page.tsx to use useTranslations(), replacing all hardcoded UI strings
• Add LanguageSwitcher component (uses useLocale() for SSR-safe locale detection) in the header

Closes #102

Test plan

• Run npm run dev and confirm the app loads in English by default
• Switch language to Português via the globe icon in the header
• Confirm navigation labels, page titles, filters and buttons update to Portuguese
• Refresh the page and confirm the selected language persists (cookie-based)
• Run npm run build and confirm TypeScript passes with no errors

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