cherry-pick SEO P2 batch → main - #1491
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…1490) Five P2 fixes from the SEO deep audit (2026-07-26): 1. CSP: allowlist analytics.ahrefs.com in script-src + connect-src. Ahrefs script was silently violating CSP on every visitor. 2. products/[slug]: add twitter:site (was only card+title+description before, every other route type ships it). 3. chains/[slug]: pluralize 'N measurement' vs 'N measurements' ('1 measurements' on Polkadot hub reads broken). 4. hyperliquid/[slug]: add Dataset JSON-LD (only had BreadcrumbList, GSC treats content-heavy pages with only breadcrumbs as 'no structured data'). Dataset carries revenue+volume variableMeasured pointing at /api/stat/hyperliquid-frontends. 5. Add /feed.json (JSON Feed 1.1) as a companion to /rss.xml. Modern readers + AI agent tooling (Perplexity crawler, LangChain document loaders, MCP clients) prefer JSON over XML. <link rel=alternate> added in layout for auto-discovery. Skipped items from the audit: - SITE.github Flotapponnier: false positive, ChainBench URL works. - robots.txt User-Agent casing: both forms are spec-compliant. - /ai.txt: no formal spec exists; llms.txt already covers. - JSON-LD body→head migration: refactor cost > payoff. - MCP directory registration: external, requires Anthropic account. Co-authored-by: Florent Tapponnier <contact@mobula.io>
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Cherry of #1490 (dev). CSP+twitter:site+grammar+hyperliquid Dataset+feed.json.