Honor `hideLocale` in routing

Honor hideLocale in routing

hideLocale: "default-locale" in your i18n config now serves the default language without URL prefix, so routes match page.url: content pages, src/pages, blog routes, Open Graph images and .md versions all follow. Build language-aware links in plugins and layouts with this.localizePath(lang, pathname).

Root pages of i18n sites

Static i18n builds emit index.html (a redirect to the default language, or its index page when the prefix is hidden) and a root 404.html. Pages with autoI18n: false render inside the root layout of the default language instead of a bare document.

Locale switch with hidden prefix

Switching back to the default language no longer navigates to a prefixed URL that does not exist.

Integrations follow the prefix policy

localeRoutes() and withLang() are available from fumapress/internal, so plugins outside the core can register one route per language too. That entry point is not covered by semver. The Tegami changelog routes, the Mintlify 404 redirect and the get_page tool of the MCP server follow the policy now, instead of assuming every language has a URL prefix.