Adds ScanSchedule type, getScanSchedule / updateScanSchedule
against the new admin endpoints, createScanScheduleQuery (60s
staleTime; refetches on focus + after PATCH invalidation — no
polling).
New qk.scanSchedule() key follows the existing tuple pattern.
ScanScheduleUpdate uses optional fields so mode=off updates can
omit per-mode fields entirely (server normalizes anyway).
Vitest covers the GET path, PATCH with body, and the mode=off
minimal-body case.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>