Dynamic AGB address, real shipping costs on /versand instead of hardcoded constants

- AGB: name/address/email now come from company-settings via new
  VertragspartnerBlock (mid-document, see LegalPages.ts's contentPart2).
- VersandSections/VersandModal/CartContent/CheckoutContent/versand page:
  shipping cost and free-shipping threshold now come from the real
  ShippingMethods data (already fetched elsewhere for checkout), not the
  hardcoded lib/shipping.ts constants — those had already drifted from
  the real Payload values once. lib/shipping.ts deleted, nothing left to
  export.

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

app/components/VersandModal.tsx

@@ -17,10 +17,14 @@ export function VersandModal({
   open,
   onClose,
   shipping,
+  shippingCost,
+  freeShippingThreshold,
 }: {
   open: boolean;
   onClose: () => void;
   shipping: ShippingSettings;
+  shippingCost: number;
+  freeShippingThreshold: number | null;
 }) {
   const dialogRef = useRef<HTMLDivElement>(null);
   const closeButtonRef = useRef<HTMLButtonElement>(null);
@@ -109,7 +113,7 @@ export function VersandModal({
             </div>
 
             <div className="px-8 py-6 pb-8">
-              <VersandSections shipping={shipping} />
+              <VersandSections shipping={shipping} shippingCost={shippingCost} freeShippingThreshold={freeShippingThreshold} />
             </div>
           </motion.div>
         </motion.div>