Mirror the es/ pattern: docs/legal/pt/ + docs/o-que-e-tane.md as the
Portuguese source of truth, build-legal.sh extended to generate the
Hugo pt.* pages from them, config.toml gets a [languages.pt] entry,
i18n/pt.json translates the UI chrome. og-pt.png is a placeholder copy
of og-en.png until a proper Portuguese social card is made by hand
(same as the other og-*.png, per DEPLOY.md). Verified locally with the
Docker build: /pt/, /pt/about/, all four /pt/legal/ pages and the
lang-switch link all resolve correctly.
vjrj
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