Public route/config loading API for routing-aware tooling

[sushichan044]

Related: #12522

I want to build routing-aware static analysis tools for my own React Router Framework Mode projects, such as validating route module paths or writing flexible lint rules that match project-specific practices.

To do that safely, I need access to the same framework graph that React Router already loads internally:

• resolved react-router.config.ts, including presets
• resolved app/routes.ts as RouteConfigEntry[]
• generated RouteManifest

This is possible to hack together today by shelling out to react-router routes --json, or by re-implementing parts of React Router's loading behavior in userland. But those are not healthy foundations for tooling.
I want to maintain across React Router releases.

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Could React Router expose a small documented API for this?

I am asking for the lower-level public API that would let community tooling load the official framework config/routes graph directly.

[sushichan044]

resolved app/routes.ts as RouteConfigEntry[]

To explain the background, this is necessary because for static analysis, we need to be able to load routes.ts files that might be semantically invalid from the perspective of React Router.