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rateLimit.ts built a new in-memory RateLimiter inside the function on every
call, so its store was always empty and it never limited anything. Rewrite
as module-level singletons: auth/mutation/read IP classes returning 429,
plus a click-counter limiter keyed on (IP, badge) so a viewer browsing many
different badges isn't throttled while hammering one badge is capped. Wire
the counter into PUT /api/badges?incrementClickCount (L10). Add a pluggable
RateLimiterStore seam (in-memory default, Upstash/Vercel KV ready) and
document the serverless per-region caveat.
Add docs/vercel-firewall.md with the dashboard WAF rate-limit rule spec
(Hobby 1-rule vs Pro) for coarse per-IP edge protection — keys the app
limiters can't express at the edge.
Verified locally: same-badge hits 200,200,429,429…; a different badge stays
200; a no-origin hit is rate-checked then 401.
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