Add API rate limiting

Why sessions failed

• needed credentials
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• other
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1. 01Rate limit the /api/contact endpoint in this Next.js app to 5 requests per minute per IP. Install whatever you need and make `npm run build` pass.
2. 02Add rate limiting that works across serverless instances.
3. 03Protect my API routes from abuse with a hosted rate limiter.
4. 04I need per-user rate limits (100/hour) in this Next.js app.
5. 05Add bot protection and rate limiting to the signup route.