Add TypeScript types for routes

**Feature request**
It would be great to have retry for helpers.

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

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

The issue names no files, tests, or entry points and its title conflicts with the body. Start by locating the route helpers and configuration handling, then clarify whether the requested work is TypeScript route types or retry support; done should match the confirmed scope and include coverage for the new behavior.

Written by the indexing model from the issue text.