fix(invoice): drop fulfillmentOrders query (scope-denied), keep shippingLine pickup heuristic

Querying Order.fulfillmentOrders.deliveryMethod requires the
read_merchant_managed_fulfillment_orders scope (not read_orders, despite
what shopify.dev claims) and was failing with 'Access denied for
fulfillmentOrders field' against real stores.

Adding that scope would force every install to re-grant permissions, so
instead we rely on shippingLine alone:

- Shopify Local Pickup app: shippingLine.code = 'Pickup' (caught by the
  regex) and shippingLine.title is the chosen location name itself   (e.g. 'Lager Graz') \u2014 perfect as pickupLocationName.
- Custom-rate pickup ('Abholung im Lager'): regex matches title/code,
  title is used as the location hint.

Removes RawDeliveryMethod, the deliveryMethods field on RawOrderForInvoice,
and the fulfillmentOrders edges from RawAdminResponse.

scripts/render-sample.ts

@@ -137,7 +137,6 @@ function buildAtB2BOrder(): RawOrderForInvoice {
     paymentGatewayNames: ["manual"],
     taxesIncluded: false,
     discountCodes: [],
-    deliveryMethods: [],
     customer: {
       firstName: "Lukas",
       lastName: "Schmidhofer",
@@ -299,18 +298,14 @@ function buildDiscountedOrder(): RawOrderForInvoice {
 function buildPickupOrder(): RawOrderForInvoice {
   const o = buildAtB2BOrder();
   o.shippingLine = {
-    title: "Local Pickup — Lager Graz",
-    code: "PICKUP",
-    source: "shopify-local-pickup",
+    title: "Lager Graz",
+    code: "Pickup",
+    source: "shopify",
     carrierIdentifier: null,
     originalPriceSet: { shopMoney: { amount: "0.00", currencyCode: "EUR" } },
     discountedPriceSet: { shopMoney: { amount: "0.00", currencyCode: "EUR" } },
     taxLines: [],
   };
-  // Primary signal — what Shopify Local Pickup actually populates.
-  o.deliveryMethods = [
-    { methodType: "PICK_UP", locationName: "Lager Graz" },
-  ];
   return o;
 }
 
@@ -598,8 +593,8 @@ async function main() {
     settings: settings as never,
     invoiceNumber: "RE-1030",
   });
-  assert("isPickup detected via DeliveryMethodType=PICK_UP", pickupVm.isPickup);
-  assertEq("pickupLocationName propagated", pickupVm.pickupLocationName, "Lager Graz");
+  assert("isPickup detected via shippingLine heuristic", pickupVm.isPickup);
+  assertEq("pickupLocationName propagated from shippingLine.title", pickupVm.pickupLocationName, "Lager Graz");
   assert("shippingMethod cleared for pickup (renderer uses pickup row instead)",
     pickupVm.shippingMethod == null);
   assert(
@@ -616,17 +611,6 @@ async function main() {
     !pickupText.includes("Lieferadresse"),
   );
 
-  // Shopify-Local-Pickup-app fallback: methodType missing but shippingLine
-  // is named "Pickup at …".
-  const legacyPickupOrder = buildPickupOrder();
-  legacyPickupOrder.deliveryMethods = [];
-  const legacyPickupVm = composeInvoice({
-    order: legacyPickupOrder,
-    settings: settings as never,
-    invoiceNumber: "RE-1032",
-  });
-  assert("legacy heuristic still detects pickup from shippingLine", legacyPickupVm.isPickup);
-
   // EN translation
   const pickupEnVm = composeInvoice({
     order: pickupOrder,