- Added comprehensive integration tests for rate limiting middleware:
* Global rate limiting (IP-based, 5 requests/minute)
* Endpoint-specific rate limiting (login: 3 attempts, register: 2 attempts)
* Different IPs have separate limits
* Rate limit headers presence and correctness
* Endpoint-specific headers (X-LoginLimit-*, etc.)
* Unauthenticated rate limiting
* Multiple endpoints with separate limits
- Tests use SimpleRateLimiter and EndpointLimiter without Redis for integration testing
- All tests tagged with integration build tag
