- Implement LeakyBucketRateLimiter with configurable capacity and rate
- Add RateLimit annotation and AOP aspect for automatic rate limiting
- Create RateLimitExceededException for custom error handling
- Add RateLimiterConfig for configuration management
- Update LoginController with @RateLimit annotation on login endpoint
- Add rate limiter configuration to application.yml
- Update project documentation with comprehensive README
- Upgrade Java version to 21 and Lombok to 1.18.30