doc: add Portuguese (Brazil) (pt-br) documentation translations

[kejhz653-stack]

Summary

• Add machine-translated PO files for Portuguese (Brazil) (pt-br) documentation locale
• Translations are based on the zh_CN template using DeepSeek API

Preview

Language	URL
Portuguese (Brazil)	https://inference-i18n-pt-br.readthedocs.io/pt-br/latest/

Test plan

• Verify RTD build succeeds for pt-br after merge
• Configure RTD translation for pt-br on the main inference project

Made with Cursor

[gemini-code-assist]

Code Review

This pull request adds Brazilian Portuguese (pt_BR) localization support, introducing a compilation script (doc/build_i18n.py) to build .mo catalogs, integrating it into the ReadTheDocs and Sphinx configurations, and expanding the language switcher to support multiple new languages. The review feedback highlights several critical translation issues, including translation API hallucinations, prompt leaks, mistranslations (such as translating 'Code standards' as 'Código de Conduta'), and broken reStructuredText syntax markers (replacing '::' with ':'). Additionally, a robustness issue was identified in doc/build_i18n.py where an unhandled ImportError would occur if the babel library is missing, and a fallback mechanism to sphinx-intl was suggested.

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[kejhz653-stack]

Please review this pr @qinxuye .Thanks！

[OliverBryant]

LGTM