Fix CARD production timeout with dns.setDefaultResultOrder('ipv4first')

The family:4 option on individual requests wasn't sufficient.
Node.js 18 needs dns.setDefaultResultOrder('ipv4first') called
at module load time to prevent IPv6 resolution attempts to
card.charter.com which is unreachable via IPv6 from this network.

backend/scripts/card-connectivity-test.js

@@ -3,6 +3,7 @@
  * CARD API Connectivity Test
  * Tests: token acquisition → teams list → sample asset lookup
  */
+require('dns').setDefaultResultOrder('ipv4first');
 require('dotenv').config({ path: require('path').join(__dirname, '..', '.env') });
 
 const { isConfigured, missingVars, testConnection, getTeams } = require('../helpers/cardApi');