Add configuration options for search

**Feature request**
It would be great to have search for routes.

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

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

Start by locating the configuration entry point and the route-search handling in the Shell-based CLI. Trace how configuration defaults are defined and how route requests are processed. Done means an `enable_search` option defaults to `false` and clearly controls whether route search is available; add or update tests if the project has coverage for configuration behavior.

Written by the indexing model from the issue text.