seo: per-page OG images + JSON-LD per page type (Article, Product, FAQPage)

[BryanFRD]

Current state: each marketing site has Layout-level meta tags (title, description, OG, twitter, canonical, hreflang) and a single JSON-LD @type: Organization (FerrLabs holding) or @type: WebSite (FerrFlow).

Improvements worth landing:

• Per-page OG images — render the page H1 onto the brand template (via @vercel/og at build time). Drop into PR previews + organic links.
• Schema.org per-page:
  • Marketing landing → @type: Product with brand, offers, ratings
  • Docs (FerrFlow) → @type: TechArticle per page
  • Pricing → @type: PriceSpecification
  • FAQ sections → @type: FAQPage
• breadcrumbs JSON-LD for nested pages (Starlight docs especially)
• <link rel="author"> for tech articles
• <meta name="author"> at Hand-built in Lille, FR level

Defer until product info stabilises.