Add TypeScript types for config

**Feature request**
It would be great to have encryption for controllers.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_encryption` with default `false`.

The title asks for TypeScript config types, while the body requests controller encryption and a new enable_encryption option. Start by locating the configuration definition and controller implementation, then determine the intended scope and expected behavior before changing anything. Done should include a clear decision on whether to add the typed option, encryption behavior, or both, with appropriate validation.

Written by the indexing model from the issue text.