feat: rate limit api routes (#336)

* feat: install rate-limiter-flexible and ioredis

* feat: setup redis client

* feat: add withRateLimit wrapper

* feat: wrap trpc endpoint in withRateLimit

* feat: wrap withRateLimit on remaining routes

* feat: exclude webhook route from rate limiting

* chore: update compose files and readme

* refactor: move into api/db packages

docker-compose.yml

@@ -18,6 +18,9 @@ services:
       - BETTER_AUTH_SECRET=${BETTER_AUTH_SECRET}
       - POSTGRES_URL=${POSTGRES_URL}
 
+      # Redis (optional - for rate limiting)
+      - REDIS_URL=${REDIS_URL}
+
       # Admin API key (optional)
       - KAN_ADMIN_API_KEY=${KAN_ADMIN_API_KEY}