fix: scope public domain to single binding and return single port check

Accept internalPort in AddPublicDomainParams to target a specific
binding. Disable the domain on all other bindings. Return a single
CheckPortRes instead of Vec. Revert multi-port UI to singular port
display from 0f8a66b35.

sdk/base/lib/osBindings/AddPublicDomainParams.ts

@@ -6,4 +6,5 @@ export type AddPublicDomainParams = {
   fqdn: string
   acme: AcmeProvider | null
   gateway: GatewayId
+  internalPort: number
 }

sdk/base/lib/osBindings/AddPublicDomainRes.ts

@@ -1,7 +1,4 @@
 // This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
 import type { CheckPortRes } from './CheckPortRes'
 
-export type AddPublicDomainRes = {
-  dns: string | null
-  port: Array<CheckPortRes>
-}
+export type AddPublicDomainRes = { dns: string | null; port: CheckPortRes }