fix(orders): remove driver offers; only adhoc orders are offered

[roncodes]

What

Removes the driver offers added in #394. An order assigned to a driver is simply theirs; only adhoc orders are offered to drivers, and Fleet-Ops' existing adhoc flow already handles that.

Why

#394 made every driver assignment an expiring offer in meta.offer (5 minutes by default). When the driver did not tap Accept, the order was marked expired and dispatch got "driver has not accepted", even though the driver was assigned and the order was theirs. That is not how dispatch works:

• Assigned (by dispatch or auto-assign): the driver is notified and the order is theirs. Nothing to accept.
• Adhoc: dispatching pings drivers within adhoc_distance (OrderPing), fleetops:dispatch-adhoc pings again every minute while nobody has taken it, and a driver takes it with start + assign. This existed before feat(orders): status-guarded edits, order.changed events, driver offers #394 and is unchanged.

meta.offer duplicated the adhoc flow and applied it to assigned orders.

Changes

Reverts ea06435 ("driver offers with accept, decline and expiry"):

• meta.offer and its sync on assignment (order observer saving, bulk assign in the internal driver and order controllers)
• POST v1/orders/{id}/accept and POST v1/orders/{id}/decline
• fleetops:expire-offers (scheduled every minute), the driver_not_accepted alert (DriverNotAccepted), OrderOfferDeclined, the order.offer_expired|accepted|declined broadcasts (OrderOfferChanged)
• offer on the v1 order resources; the fleetops.offer_timeout_minutes setting

Kept from #394: status-guarded edits and order.changed, telling a driver when an order is taken off them, and cancel with a reason. The cancel endpoint keeps the reasonFromRequest helper it shared with decline.

API and docs impact

• Removes two public endpoints and the offer field that feat(orders): status-guarded edits, order.changed events, driver offers #394 added (unreleased; no tag contains feat(orders): status-guarded edits, order.changed events, driver offers #394).
• Document order operations: payments, edits, stock, booking slots and comment visibility postman#67 and fleetbase/fleetbase.io#129 document offers and need the same removal.
• v3: realtime order changes, reassignment, order chat and bookings navigator-app#114 drops its direct-offer UI in the same change (d6282b1).
• fleetbase/storefront release/v0.4.25 no longer reads meta.offer (318baba).

Validation

Ran each test file on its own, as the repo's file runner does, with PHP 8.3, on this branch and on release/v0.6.72:

• 507 files, 3266 tests. The files with errors or failures (21: realtime ingestion, tracking, socket channels and driver auth) fail the same way on release/v0.6.72 without this change. They look like local environment and vendor drift.
• ApiOrderControllerContractsTest: 18 tests (19 before; the offers test is removed), 0 errors. OrderControllerLifecycleActionsTest, OrderOperationsTest, OrderChangeNotificationsTest, OrderAssignmentObserverTest: pass.
• php-cs-fixer clean on the changed files.

Existing orders may still have a meta.offer from #394. Nothing reads it any more.