contractnumber provider added, old provider number field only if no previous contact exist

frontend/src/components/contracts/ContractDetailModal.tsx

@@ -105,6 +105,39 @@ export default function ContractDetailModal({ contractId, isOpen, onClose }: Con
                     </dd>
                   </div>
                 )}
+                {c.contractNumberAtProvider && (
+                  <div>
+                    <dt className="text-sm text-gray-500">Vertragsnummer beim Anbieter</dt>
+                    <dd className="font-mono flex items-center gap-1">
+                      {c.contractNumberAtProvider}
+                      <CopyButton value={c.contractNumberAtProvider} />
+                    </dd>
+                  </div>
+                )}
+              </div>
+            </Card>
+          )}
+
+          {/* Zähler (nur bei Strom/Gas) */}
+          {(c.type === 'ELECTRICITY' || c.type === 'GAS') && c.energyDetails?.meter && (
+            <Card title="Zähler">
+              <div className="grid grid-cols-2 gap-4">
+                <div>
+                  <dt className="text-sm text-gray-500">Zählernummer</dt>
+                  <dd className="font-mono flex items-center gap-1">
+                    {c.energyDetails.meter.meterNumber}
+                    <CopyButton value={c.energyDetails.meter.meterNumber} />
+                  </dd>
+                </div>
+                {c.energyDetails.maloId && (
+                  <div>
+                    <dt className="text-sm text-gray-500">MaLo-ID</dt>
+                    <dd className="font-mono flex items-center gap-1">
+                      {c.energyDetails.maloId}
+                      <CopyButton value={c.energyDetails.maloId} />
+                    </dd>
+                  </div>
+                )}
               </div>
             </Card>
           )}