Move e-payment to Settings and add ZarinPal credentials.

Gateway config now lives on the general Settings page, with Mellat fields in a 3-column layout and ZarinPal available at checkout.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/business/src/index.css

@@ -120,6 +120,12 @@ body::before {
   }
 }
 
+/* Portaled dialogs sit on body; blur the app behind them. */
+body:has([aria-modal='true']) #root {
+  filter: blur(var(--modal-overlay-blur, 16px));
+  pointer-events: none;
+}
+
 button {
   font-family: inherit;
   cursor: pointer;