feat: add rate limiter utility for API endpoints

[shivv23]

Add rate limiter utility for API endpoints.

Changes:

• app/rate_limiter.py: New file with RateLimiter class and middleware

Provides token bucket rate limiting with configurable limits.

[ivantha]

This PR's head branch is behind main. Please rebase onto the latest main (e.g. git fetch origin && git rebase origin/main) and force-push to make it mergeable.

Note: the RateLimiter/RateLimitMiddleware are not yet wired into main.py — consider integrating them or tracking that as a follow-up.

[shivv23]

Thanks @ivantha! The branch is now rebased onto main.Regarding the RateLimiter not being wired into main.py - you're right. This PR adds the rate limiter utility/decorator. Wiring it into the API endpoints will be done in a follow-up PR to keep changes focused.

[github-actions]

PR Review

Rebase

Merge commits detected — please use rebase instead of merge:

bd2aa71 Merge branch 'main' into pr/rate-limiter-utility

Squash

Your PR has 2 commits. Please squash into a single commit.

How to fix

git fetch origin
git rebase -i origin/main   # mark all but first commit as "squash"
git push --force-with-lease

---

This comment updates automatically on each push.