Enhanced filtering and sorting added for Sessions and Events APIs

AI Impact Summary

The system now supports enhanced filtering: sessions can be filtered by status, and events can be filtered by type or creation time. This implies new API query parameters on the Sessions API (status) and Events API (type, created_at) and will require backend query planning and indexing to keep response times predictable. Operators should validate combined filters, ensure consistent default sorting, and monitor for any performance impact on large datasets.