feat: contacts and voucher assignment

app/api/vouchers/route.ts

@@ -33,6 +33,9 @@ export async function POST(req: NextRequest) {
   const errs = validateVoucher(input);
   if (errs.length) return NextResponse.json({ errors: errs }, { status: 400 });
   const db = getDb();
+  const contactIds: number[] = Array.isArray(body.contactIds)
+    ? body.contactIds.map(Number).filter((n: number) => Number.isInteger(n))
+    : [];
   const created = await db.voucher.create({
     data: {
       name: input.name.trim(),
@@ -43,6 +46,7 @@ export async function POST(req: NextRequest) {
       codeText: input.codeText,
       kategorie: input.kategorie,
       notiz: input.notiz,
+      contacts: contactIds.length ? { create: contactIds.map((contactId) => ({ contactId })) } : undefined,
     },
   });
   return NextResponse.json(created, { status: 201 });