[kevincodex1]

Summary

Adds Elysium (Kinetiq's Arbitrum Orbit L2 for Hyperliquid, chain 99901, gas paid in HYPE) to the site as a fourth chain, behind the existing "Coming soon" gate. Until NEXT_PUBLIC_LAUNCH_FACTORY_ELYSIUM is set, the form shows Elysium as "Coming soon", /elysium returns 404, and no switcher offers it. The contracts are already live on Elysium (block 3986599), so switching on is configuration only.

Stacked on the contracts PR (feat/elysium). Merge that one first: the app's deployments test needs contracts/deployments/launchpad-elysium.json from it.

• Chain: id 99901, HYPE as a plain 18-decimal native asset, public RPC fallback (ELYSIUM_RPC_URL overrides it on the server), Multicall3, explorer under elysium.kinetiq.xyz/explorer.
• Uniswap v4: addresses from deployments/99901.md. Universal Router v2.1.2 with the v2 swap layout, proven on a fork with a USDC pool.
• Quotes:
  • HYPE (native, the default) and USDC at a fixed dollar.
  • WHYPE is a known quote, priced at HYPE's price.
  • A new hype quote key carries HYPE's live price, filled on the server the way GITLAWB's is. hypePrice.ts reads Coinbase HYPE-USD first, falls back to Hyperliquid allMids, serves the last good value for at most 15 minutes, then reports null.
• Launch form: decides "native quote" by address(0) (isNativeQuote) instead of the eth key, so HYPE takes the native path: msg.value, no approvals, gas reserve taken from the same balance. Presets are in HYPE.
• Indexer: LAUNCH_DEPLOY_BLOCK_ELYSIUM; 2 confirmations, like Robinhood Chain (also Orbit); lag alert at 4,000 blocks (100 ms blocks).
• Env plumbing: .env.example, Dockerfile, fly.toml, fly-secrets.sh, and the dev RPC list in the CSP.

Deliberately not in this PR

• Site-wide copy that lists the chains by hand: brand title and tagline, footer, hero, about, me, feed, rules intro, README. It comes with the switch-on, so the site never advertises a chain it can't launch on yet.
• The bridge dialog. Relay supports Elysium; that's a follow-up.
• The official Elysium mark. public/brand/elysium-placeholder.svg is a neutral lettermark, not Kinetiq's logo. Replace it with the official mark (source recorded in the file) before the switch-on.

Test plan

• tsc --noEmit clean, npm run lint clean
• npm test: 1391 tests, 1380 pass, 11 skipped, 0 fail. New tests: hypePrice.test.ts; Elysium cases in native-quote.test.ts (HYPE is never priced as ETH; WHYPE shares HYPE's key; the HYPE SQL arm is chain-scoped). The chain-name branch guard now covers elysium and 99901.
• Production build with the Elysium factory set: /elysium is built
• Local smoke run with Elysium configured:
  • /elysium returns 200
  • the form offers HYPE and USDC, with HYPE's live price passed in
  • /api/rpc?chain=elysium answers chain id 0x1863d
• Switch-on: set NEXT_PUBLIC_LAUNCH_FACTORY_ELYSIUM / NEXT_PUBLIC_LAUNCH_LOCKER_ELYSIUM (build args), LAUNCH_DEPLOY_BLOCK_ELYSIUM=3986599 and ELYSIUM_RPC_URL (secrets); swap in the official mark; add the site copy

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