[ HumanjavaEnterprises/node-red-contrib-nostr ] fix: add type assertion for Node-RED registerType compatibility

Cast the node constructor to any to satisfy registerType's generic
constraint, which doesn't account for custom properties added to nodes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
https://github.com/HumanjavaEnterprises/node-red-contrib-nostr/commit/a55dab96ef1aaa19c25adcb308933053d015f3e4