Update validation documentation

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

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

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

Start by locating the configuration handling and service deployment entry points in the repository, then trace how validation options are defined and applied. Determine the required encryption behavior and its interaction with production services; done means the option is documented, defaults to false, and the related behavior is covered by the project's checks or tests.

Written by the indexing model from the issue text.