fix: expire stale auth challenges - #1438
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Fixes #1320.
This PR fixes �ackend/src/services/authService.ts::verifyChallengeTimestamp so the freshness check compares elapsed age as
ow - timestamp instead of subtracting in the opposite direction.
The existing �uthService unit coverage already includes the replay boundary this restores: timestamps within the max-age window are accepted and timestamps older than the window are rejected.
Validation: static GitHub API/source inspection only; local backend tests were not run in this environment to avoid installing or executing additional toolchains.