fix(auth): honor request timeout during configure

[JerryNee]

Summary

• pass requestTimeoutMs into the pre-write /me validation client used by auth configure / setup
• ensure a configured short request timeout also bounds the key-validation ping before credentials are written
• add regression coverage that proves the validation fetch receives an abort signal and credentials are not persisted on timeout

Why

runConfigure builds a one-off HttpClient so it can validate the candidate key before writing credentials. That path bypassed makeHttpClient, so the global --request-timeout value was parsed but not applied to the validation ping.

Verification

• npm test -- src/commands/auth.test.ts
• npm run lint
• npm run typecheck
• npm test
• npm run build