Security patch

Per 2026年05月24日 OSV-Scanner audit: 28 vulnerabilities cleared (1 CRITICAL, 17 HIGH, 10 MOD) → 0.

Top fixes:

• @clerk/shared ^4.13.1 (CRITICAL GHSA-vqx2-fgx2-5wq9)
• tar ^7.5.1 (6 HIGH transitive vulns via @remix-run/dev)
• undici ^7.16.0 (2 HIGH)
• React 18 → 19, Stripe 17 → 22, Wrangler 3.99 → 4.94, Vite 5 → 7

Install: npm install --legacy-peer-deps (Remix 2.17 + Vite 7 peer drift).

See PR #1 for the full diff.