curl -X PUT "https://api.hitler.app/api/clients/client-uuid-1/members" \
  -H "Authorization: Bearer YOUR_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"writerIds": ["user-uuid-1"], "designerIds": ["user-uuid-2"]}'

await api.assignClientMembers("client-uuid-1", {
  writerIds: ["user-uuid-1"],
  designerIds: ["user-uuid-2"],
});

{
  "id": "client-uuid-1",
  "name": "Acme Corp",
  "assignedWriters": ["user-uuid-1"],
  "assignedDesigners": ["user-uuid-2"],
  "writers": [{"id": "user-uuid-1", "name": "Alice", "email": "alice@example.com"}],
  "designers": [{"id": "user-uuid-2", "name": "Bob", "email": "bob@example.com"}]
}