Fulfillment Numbers Lead With The Order Number

New fulfillment numbers on V2 orders read ORDERNUMBER-F-XXXXX, where they used to read FO-ORDERNUMBER-XXXXX. Numbers already issued keep their original shape, so both forms are live: treat a fulfillment number as an opaque identifier and match on the whole string rather than parsing it.

Manually created V2 orders also take a shorter default order number, something like EC-A1B2C rather than EC-MANUAL-XXXXX. It is a default an operator can still change before saving. V1 order numbering is unchanged.