Show company name + VAT ID on the account order-detail page; pick up Netto-row invoicing update

Order detail (/konto/bestellungen/[orderNumber]) already carried
companyName/vatId/vatExempt on CustomerOrderDetail but never rendered
them — a B2B customer looking at their own order couldn't see the
company/VAT info that's already on their invoice. Now shown in the
billing-address block, with a note when the order was VAT-exempt.

Also bumps @einfach-produktiv/invoicing to pick up the Netto-row fix
(now shown on every invoice, not just non-exempt ones).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/konto/bestellungen/[orderNumber]/page.tsx

@@ -87,6 +87,9 @@ export default async function KontoBestellungDetailPage({ params }: { params: Pr
                 common case (no override) keeps the original "Lieferadresse"
                 label, since that's exactly what this address still is. */}
             <p className="text-label text-text-muted">{order.hasDifferentShippingAddress ? "Rechnungsadresse" : "Lieferadresse"}</p>
+            {order.companyName && (
+              <p className="text-body-sm text-text-primary">{order.companyName}</p>
+            )}
             <p className="text-body-sm text-text-primary">
               {order.customerFirstName} {order.customerLastName}
             </p>
@@ -94,6 +97,12 @@ export default async function KontoBestellungDetailPage({ params }: { params: Pr
             <p className="text-body-sm text-text-primary">
               {order.zip} {order.city}, {order.country}
             </p>
+            {order.vatId && (
+              <p className="text-body-sm text-text-muted">
+                USt-IdNr. {order.vatId}
+                {order.vatExempt && " · steuerfreie innergemeinschaftliche Lieferung"}
+              </p>
+            )}
           </div>
 
           {order.hasDifferentShippingAddress && (