[billyvg]

Adds apiOptions.contract() and apiOptions.contractInfinite(). They take the response type from the generated ApiMapping (stacked on #129590), so callers no longer pass it by hand:

// before
apiOptions.as<Team[]>()('/organizations/$organizationIdOrSlug/teams/', {path, staleTime});
// after: the type is the response the backend declares for this route's GET
apiOptions.contract('/organizations/$organizationIdOrSlug/teams/', {path, staleTime});

They only accept routes whose GET declares a response type on the backend. Any other route fails typecheck instead of quietly becoming unknown, and stays on as<T>(). This PR changes no call sites.

🤖 Generated with Claude Code

[linear-code]

ENG-8963

[sentry]

Sentry Snapshot Testing

Name	Added	Removed	Changed	Renamed	Unchanged	Skipped	Status
sentry-frontend sentry-frontend	0	0	0	0	780	0	✅ Unchanged

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