- config.ts: og:site_name, og:image (+w/h/alt), twitter:card/site/image
- config.ts: transformPageData — per-page canonical, og:url, og:locale,
og:locale:alternate, hreflang for all 6 locales + x-default,
og:title/description and twitter:title/description from frontmatter
- config.ts: sitemap with xhtml:link alternates for all 174 pages × 6 locales
- SchemaOrg.vue: SoftwareApplication JSON-LD on EN homepage only
- HomeLayout.vue: render SchemaOrg in home-features-after slot
- index.md + de/fr/es/it/pl index.md: add translated title to frontmatter
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