Noindex untranslated pages

[pettinarip]

Description

Add robots noindex for untranslated pages (MD and non‑MD), improving SEO by avoiding indexing fallback English content.

Changes

• MD pages: Use importMd’s isTranslated to set noIndex in getMetadata.
• Non‑MD pages: Determine translation via isPageTranslated(locale, slug) and include noindex logic in getMetadata.
• Extract the primary namespace mapping logic to its own function getPrimaryNamespaceForPath to determine if isPageTranslated
• Reorganize i18n helpers to src/lib/i18n

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Lighthouse	7 paths audited Performance: 47 (🔴 down 3 from production) Accessibility: 94 (no change from production) Best Practices: 92 (🔴 down 8 from production) SEO: 92 (no change from production) PWA: 59 (no change from production) View the detailed breakdown and full score reports

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[wackerow]

Looking good @pettinarip... logic looks good and spot checking some pages everything seems to be working as expected.