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/PaymentsPage.tsx

@@ -75,6 +75,13 @@ export default function PaymentsPage() {
       header: 'درگاه',
       render: (p) => <span className="chip" style={{ fontSize: 12 }}>{p.gateway}</span>,
     },
+    {
+      key: 'origin',
+      header: 'مبدأ',
+      render: (p) => p.origin
+        ? <span className="chip" dir="ltr" style={{ fontSize: 12 }}>{p.origin}</span>
+        : <span className="muted">—</span>,
+    },
     {
       key: 'ref_id',
       header: 'شماره مرجع',
@@ -142,7 +149,7 @@ export default function PaymentsPage() {
             <div className="field" style={{ minWidth: 240 }}>
               <MagnifyingGlassIcon style={{ width: 17, height: 17 }} />
               <input
-                placeholder="جستجو بر اساس موبایل یا شماره مرجع..."
+                placeholder="جستجو بر اساس موبایل، شماره مرجع یا دامنه..."
                 value={search}
                 onChange={(e) => { setSearch(e.target.value); setPage(1); }}
               />