fix: replace deprecated languageCode/Site.LanguageCode with locale
Hugo v0.158.0 deprecated both in favor of the locale config key and .Site.Language.Locale, matching pivoine.art's config. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01S3xLyuoN6uzfCYBo8kVoSn
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