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Sign-in/sign-up now throttle at 3 req/10s/IP via better-auth's built-in rate limiter; /r/ and /s/ share links throttle at 60 req/min/IP via proxy.ts using the existing Redis-backed limiter (Next 16's Proxy always runs Node.js, no Edge-runtime blocker after all). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>