Add TypeScript types for api

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

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

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

The issue title mentions TypeScript types for an API, while the body requests controller caching and an `enable_caching` configuration option. No files, tests, or entry points are identified; first clarify the intended scope and locate the controller and configuration code. Done should include agreed caching behavior and coverage for the default-disabled option.

Written by the indexing model from the issue text.