feat(core): refactor hostname to ServerHostnameInfo with name/hostname pair

- Rename Hostname to ServerHostnameInfo, add name + hostname fields
- Add set_hostname_rpc for changing hostname at runtime
- Migrate alpha_20: generate serverInfo.name from hostname, delete ui.name
- Extract gateway.rs helpers to fix rustfmt nesting depth issue
- Add i18n key for hostname validation error
- Update SDK bindings

core/src/context/setup.rs

@@ -19,7 +19,7 @@ use crate::MAIN_DATA;
 use crate::context::RpcContext;
 use crate::context::config::ServerConfig;
 use crate::disk::mount::guard::{MountGuard, TmpMountGuard};
-use crate::hostname::Hostname;
+use crate::hostname::ServerHostname;
 use crate::net::gateway::WildcardListener;
 use crate::net::web_server::{WebServer, WebServerAcceptorSetter};
 use crate::prelude::*;
@@ -45,7 +45,7 @@ lazy_static::lazy_static! {
 #[ts(export)]
 pub struct SetupResult {
     #[ts(type = "string")]
-    pub hostname: Hostname,
+    pub hostname: ServerHostname,
     pub root_ca: Pem<X509>,
     pub needs_restart: bool,
 }