cherry-pick seo hygiene P0 → main - #1474
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…age (#1473) Four verified crawl / SEO issues confirmed on prod (2026-07-26): 1. Sitemap + /api/citable served no s-maxage, every crawl re-ran the loader chain (x-vercel-cache: MISS observed). Add explicit Cache-Control on both via next.config.ts headers(). 2. /404 emitted two identical <meta name="robots" content="noindex"> tags because not-found.tsx set { index: false } and Next merged instead of replacing the layout's robots shape. Give not-found the full IS_STAGING-style shape so Next replaces. 3. Mixed-case URLs served 200 instead of 308-lowercase (/products/Alchemy, /Benchmarks/foo). Add case-normalising 308 at the top of middleware; broaden matcher to cover every HTML route. 4. Bench pages with chain variants (aggregator-head-lag, perp-fees) emitted 4-5 <meta property="og:image"> tags via generateImageMetadata fanning out per-chain entries. Social scrapers picked nondeterministically. Chain-scoped OG cards were never rendered on the actual /[chain] pages anyway (they inherit the site-wide OG), so the fan-out gave no upside. Return only the default entry. Co-authored-by: Florent Tapponnier <contact@mobula.io>
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Cherry-pick of #1473 (merged to dev). Same 4 verified P0 fixes: cache headers on sitemap+/api/citable, single robots meta on /404, case-normalising 308 in middleware, single og:image on chain-variant benches. See #1473 body for details.