refactor(automations): detect manual payment via OrderTransaction.manualPaymentGateway

- Drop wireTransferGatewayNames from ShopSettings (new migration).
- Replace string-matching with a GraphQL query against
  Order.transactions[].manualPaymentGateway, the first-class flag
  Shopify exposes for any merchant-defined manual payment method.
- Both webhook handlers now fetch the order on the fly to classify it,
  removing the configurable gateway-names field from settings.

app/routes/webhooks.orders.fulfilled.tsx

@@ -3,13 +3,13 @@ import { authenticate } from "../shopify.server";
 import db from "../db.server";
 import {
   generateAndEmailInvoice,
-  isWireTransferOrder,
+  isManualPaymentOrder,
 } from "../services/invoice/automations.server";
 
 /**
  * orders/fulfilled — Automation 2: when an order is fulfilled and is NOT a
- * wire-transfer order (e.g. paid by card), automatically email the invoice
- * to the customer. Wire-transfer orders are intentionally skipped here
+ * wire-transfer (manual-payment-gateway) order, automatically email the
+ * invoice to the customer. Manual-gateway orders are intentionally skipped
  * because Automation 1 already emailed them at order-create time.
  */
 export const action = async ({ request }: ActionFunctionArgs) => {
@@ -27,11 +27,9 @@ export const action = async ({ request }: ActionFunctionArgs) => {
   const orderId = payload?.id;
   if (orderId == null) return new Response();
 
-  const gateways: string[] = Array.isArray(payload?.payment_gateway_names)
-    ? payload.payment_gateway_names
-    : [];
-  if (isWireTransferOrder(gateways, settings.wireTransferGatewayNames)) {
-    // Wire-transfer order — handled by Automation 1, skip here.
+  const orderGid = `gid://shopify/Order/${String(orderId).replace(/^.*\//, "")}`;
+  if (await isManualPaymentOrder(admin, orderGid)) {
+    // Manual / wire-transfer order — handled by Automation 1, skip here.
     return new Response();
   }