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

ts/proxies/network-proxy/index.ts

@@ -1,3 +1,8 @@
 /**
  * NetworkProxy implementation
  */
+// Re-export models
+export * from './models/index.js';
+
+// Core NetworkProxy will be added later:
+// export { NetworkProxy } from './network-proxy.js';