Vendors can now request NTE uplifts from the dispatch detail page and
dispatchers can approve or deny them (with tier-gated buttons) from
the work order view. Admin uplift queue page lists all requests with
status/tier filters. New Vendor POs section lists every PO with a
detail page showing vendor, linked WOs, uplift history, checklist,
signoffs, comments, and scoped audit log with print support. Vendor
portal gets a POs tab alongside Work so vendors can reconcile by PO
number.
