Implement Notification Rate Limiter

Sliding Window per Scope with Deques The core difficulty is that one accepted notification must count against three different scopes at once: the user, the team, and the company. Each scope has its own limit and its own set of recent events, so the cleanest solution is to maintain three independent sliding windows. Because every scope follows the same rule — an event counts only while the difference between the current timestamp and the event timestamp is strictly less than…