feat(invoice): add Shopify order #, shipping address/method/cost and tracking

- Query Order.shippingLine and Order.fulfillments.trackingInfo from Admin GraphQL.
- Surface orderName (#1004) so customers recognise their order alongside the sequential invoice number.
- Render shipping cost as a synthetic line item (folds into the VAT breakdown).
- Show shipping method (Versandart / Shipping method) and tracking numbers (clickable when URL present) in the meta block.
- Render a separate delivery-address block when the shipping address differs from billing.
- DE strings stay informal (Versandart / Sendungsnummer / Lieferadresse / Versand).

app/services/invoice/loadDraftOrderForOffer.server.ts

@@ -161,6 +161,8 @@ export async function loadDraftOrderForOffer(
     currencyCode: draft.currencyCode,
     displayFinancialStatus: null,
     paymentGatewayNames: [],
+    shippingLine: null,
+    fulfillments: [],
     taxesIncluded: draft.taxesIncluded,
     customer: draft.customer,
     billingAddress: draft.billingAddress,