chore: flatten HostnameInfo from enum to struct

HostnameInfo only had one variant (Ip) after removing Tor. Flatten it
into a plain struct with fields gateway, public, hostname. Remove all
kind === 'ip' type guards and narrowing across SDK, frontend, and
container runtime. Update DB migration to strip the kind field.

container-runtime/src/Adapters/Systems/SystemForEmbassy/DockerProcedureContainer.ts

@@ -93,7 +93,7 @@ export class DockerProcedureContainer extends Drop {
                 )?.hostnameInfo || {},
               )
                 .flatMap((h) => h)
-                .flatMap((h) => (h.kind === "onion" ? [h.hostname.value] : [])),
+                .map((h) => h.hostname.value),
             ).values(),
           ]
           const certChain = await effects.getSslCertificate({

container-runtime/src/Adapters/Systems/SystemForEmbassy/index.ts

@@ -1244,12 +1244,8 @@ async function updateConfig(
             ? ""
             : catchFn(
                 () =>
-                  (specValue.target === "lan-address"
-                    ? filled.addressInfo!.filter({ kind: "mdns" }) ||
-                      filled.addressInfo!.onion
-                    : filled.addressInfo!.onion ||
-                      filled.addressInfo!.filter({ kind: "mdns" })
-                  ).hostnames[0].hostname.value,
+                  filled.addressInfo!.filter({ kind: "mdns" })!
+                    .hostnames[0].hostname.value,
               ) || ""
         mutConfigValue[key] = url
       }