feat(acme): Add ACME interfaces for Port80Handler and refactor ChallengeResponder to use new acme-interfaces, enhancing event subscription and certificate workflows.

ts/proxies/nftables-proxy/index.ts

@@ -1,3 +1,5 @@
 /**
  * NfTablesProxy implementation
  */
+// Core NfTablesProxy will be added later:
+// export { NfTablesProxy } from './nftables-proxy.js';