Introduce InventoryHistoryConfig.RetentionRowsPerViewer as the single
source of truth for the 300-row audit-log cap; InventoryTransaction
aliases it and ItemAcquireHistoryController.Take() references it
directly so the two sites cannot drift. Also adds CultureInfo.InvariantCulture
to the AcquireTime.ToString() call, matching every other WireDateFormat
site in the codebase.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>