feat: add fastify rate limiting - #6
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This PR adds request throttling to the Fastify API to protect public endpoints from abuse, spam, and excessive polling.
What Changed
Installed and configured @fastify/rate-limit
Applied a global rate limit of 100 requests per minute per IP
Added a stricter rate limit of 20 requests per minute for the sensitive /api/transactions endpoint
Standardized rate-limit responses to return 429 Too Many Requests with a descriptive error message
Verification
Verified the app builds successfully with npm run build
Verified the behavior with automated tests using npm test -- --runInBand
closes #3