feat(landing): public multi-page site

[chiliec]

Summary

• Zero-dependency static site generator (scripts/build-landing.ts) with pure parseFrontMatter, renderMarkdown, renderTemplate helpers — no new npm packages
• 16-page multi-page marketing site under src/landing/dist/: home hub (live metrics tiles), gameplay/economy/faq/screens, history timeline (v1/v2/v3), investors (3 tracks), press kit, legal pages, seed devlog post
• Live public metrics API (GET /api/public/metrics, 60s cache) — player count, NFTs minted, USDT paid out, weekly active; client-side fetch fills [data-metric] spans with static fallbacks
• Serving flip — landingPath → dist/, resolveLandingFile clean-URL resolver (/investors/ → dist/investors/index.html), 404 page, dev-mode static asset serving, prod via @fastify/static
• Old src/landing/index.html deleted — superseded by dist/index.html
• tonconnect-manifest.json + logo.png remain at origin root (copied to dist/ by the build)
• Dockerfile updated: RUN npm run build:landing added after frontend build; tsx was already in dependencies

Test plan

• npm run lint — clean
• npm run typecheck — clean
• npm run test:backend — 766/766 passing (754 pre-existing + 12 new generator tests)
• npm run build:landing — 16 pages built, all assets present
• npm run dev — smoke-test all content routes return 200, /investors (no slash) 200, /nope 404, /api/public/metrics returns JSON, /tonconnect-manifest.json 200, /game serves Mini App

Notes

• The data-metric spans on home + investors use static fallbacks until MongoDB is reachable; the fetch script fills them on load
• Unverified stat on investors page ("1B Telegram users") — should be hedged before launch
• EXPEDITION_FAUCET_ENABLED copy in the seed blog post is forward-looking — update when faucet flips on

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