Release: exchange section, /eco apps page, /join, and marquee fixes

crimsoncladrequested to merge
develop into master

what's changing

four MRs, all on staging:

  • Exchanges (feat/exchanges-futures): "Where to buy HIVE" heading and copy, 34 spot venues, new Futures & Perpetuals section (12), square icons, disclaimer line; llms.txt
  • Ecosystem (feat/eco-page): app list in the static HTML, CollectionPage + ItemList and FAQPage JSON-LD, intro, search, build band, Q&A, explorer icons
  • /join (fix/join-lcp): preload only the two LCP images, performance
  • Marquee (perf/marquee-lazy): lazy-load marquee images, prioritize the LCP ones

staging post-deploy check: all PASS (titles, descriptions, H1s, cache headers).

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