fix(invoice): detect pickup via DeliveryMethodType and show 'Abholort: <location>' meta row

- Use Order.fulfillmentOrders.deliveryMethod.methodType === 'PICK_UP' as the
  primary signal (Shopify Local Pickup app exposes this reliably; the
  shippingLine title is just the location name with no 'pickup' keyword).
  Keep the legacy shippingLine string heuristic as a fallback for custom
  shipping rates merchants name 'Abholung'/'Pickup'.
- Surface assignedLocation.name as pickupLocationName on the view model.
- Replace the 'Versandart: <location name>' row with 'Abholort: <location>'
  (DE) / 'Pick-up location: <location>' (EN); falls back to plain
  'Abholung'/'Pick-up' when the location name is unavailable.

app/services/invoice/pdf/InvoiceDocument.tsx

@@ -329,7 +329,14 @@ export function InvoiceDocument({ invoice }: DocProps) {
                   <Text style={styles.metaValue}>{invoice.discountCodes.join(", ")}</Text>
                 </View>
               ) : null}
-              {invoice.kind === "invoice" && invoice.shippingMethod ? (
+              {invoice.kind === "invoice" && invoice.isPickup ? (
+                <View style={styles.metaRow}>
+                  <Text style={styles.metaLabel}>{t.pickupLocationLabel}</Text>
+                  <Text style={styles.metaValue}>
+                    {invoice.pickupLocationName ?? t.pickupLabel}
+                  </Text>
+                </View>
+              ) : invoice.kind === "invoice" && invoice.shippingMethod ? (
                 <View style={styles.metaRow}>
                   <Text style={styles.metaLabel}>{t.shippingMethodLabel}</Text>
                   <Text style={styles.metaValue}>{invoice.shippingMethod}</Text>