Cleanup skills/remote/xxx endpoints. (#14977)

Remote skills/remote/xxx as they are not in used for now.

codex-rs/tui_app_server/src/chatwidget.rs

@@ -5189,7 +5189,6 @@ impl ChatWidget {
                 );
             }
             EventMsg::ListSkillsResponse(ev) => self.on_list_skills(ev),
-            EventMsg::ListRemoteSkillsResponse(_) | EventMsg::RemoteSkillDownloaded(_) => {}
             EventMsg::SkillsUpdateAvailable => {
                 self.submit_op(AppCommand::list_skills(
                     Vec::new(),