feat(admin): show which domain a payment came from

Several storefronts share one gateway — the city booking sites and the
ClinicPro panel itself — so the payments report could not say where a
transaction originated. The payment already stores the return address it was
started with; the domain is derived from it.

Lowercased and stripped of "www." so one domain is one value in the report,
null when a payment has no return address. Exposed on both the list and the
detail (which also carries the full address), and the list search now matches
it, so filtering to a single site needs no new parameter.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

assets/admin/pages/PaymentDetailPage.tsx

@@ -92,6 +92,12 @@ export default function PaymentDetailPage() {
             <InfoRow label="مبلغ" value={formatRial(payment.amount)} />
             <InfoRow label="وضعیت" value={<StatusBadge type="payment" value={payment.status} />} />
             <InfoRow label="درگاه" value={<span className="uppercase">{payment.gateway}</span>} />
+            <InfoRow
+              label="مبدأ"
+              value={payment.origin
+                ? <span dir="ltr" title={payment.frontend_address ?? undefined}>{payment.origin}</span>
+                : null}
+            />
             <InfoRow label="شماره مرجع" value={payment.ref_id ? <span dir="ltr" className="font-mono text-xs">{payment.ref_id}</span> : null} />
             <InfoRow label="شماره کارت" value={payment.card_pan ? <span dir="ltr" className="font-mono text-xs">{payment.card_pan}</span> : null} />
             <InfoRow label="تاریخ پرداخت" value={formatDateTime(payment.paid_at)} />