Sandbox Querying & Snapshot Fix

This release improves snapshot handling and sandbox management. The API now allows creating snapshots from registry images that expose ports, fixing a key limitation when working with more complex container setups.

A major refactor introduces server-side sandbox querying, replacing client-side filtering with backend-driven pagination, sorting, and label-based filtering. This applies across the API, CLI, dashboard, and SDK, ensuring faster responses and more accurate results for large organizations. The dashboard now uses key-value label filters, the CLI and SDKs integrate the new querying model, and documentation has been updated to reflect these changes.

Together, these improvements expand compatibility for snapshot creation and deliver a more scalable and efficient way to manage sandboxes.