feat(dns-providers): add provider-agnostic DNS provider form metadata and reusable UI for create/edit flows

ts/dns/manager.dns.ts

@@ -302,7 +302,9 @@ export class DnsManager {
 
   /**
    * Build an IConvenientDnsProvider that dispatches each ACME challenge to
-   * the right CloudflareDnsProvider based on the challenge's hostName.
+   * the right provider client (whichever provider type owns the parent zone),
+   * based on the challenge's hostName. Provider-agnostic — uses the IDnsProviderClient
+   * interface, so any registered provider implementation works.
    * Returned object plugs directly into smartacme's Dns01Handler.
    */
   public buildAcmeConvenientDnsProvider(): plugins.tsclass.network.IConvenientDnsProvider {