Snapshot Lifecycle & Proxy Config

This release improves the snapshot lifecycle by implementing fallthrough state syncing, significantly speeding up the transition from pending to active.

It also makes validation optional for snapshots relying on runtime environment variables, ensuring smoother activation.

To enhance configuration flexibility, a new environment variable allows administrators to enable or disable the preview warning in the proxy service.

This version also includes critical fixes, such as caching for preview link lookups, preventing state updates for destroyed sandboxes, and correcting the Registry UI port mapping for smoother deployments.