Changes

orders-check (Amazon + eBay): don't count a voided linked order as matched

matchOrders() already captured the linked c_order's DocStatus but never
checked it - a manually voided/canceled order still counted as a resolved
match, so the reconciliation page silently showed it as handled instead
of flagging it for reimport (importSingleOrder already treats a voided
link as not-really-imported for the exact same reason; this brings the
comparison page's own matching in line with that rule).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QTy674ErXSPZ8spJ6HMhE6

Amazon/eBay orders-check: add batch/single order cancellation (VO)

Sometimes a matched order was imported with a mistake (wrong amount etc.)
and needs to be voided so it can be reimported clean. Adds a "Stornieren"
toolbar action (batch, from the checkbox selection) and a per-row cancel
button on "Interner Auftrag" (mirrors the existing import "+" button),
both calling the standard order document-action endpoint with VO.

Eligible rows: matched, linked to a real order, no invoice yet, not
already voided/closed. After a successful void the row is patched
in-place to matched:false so it immediately shows as "FEHLT" again and
can be reimported from the same page.

AgDocPreviewLink gains an opt-in onCancelOrder/canCancelOrder param pair,
symmetric with the existing onImportOrder/canImportOrder.

upload to lexoffice only zugpferd