## Summary
- fetch featured plugin IDs when the loaded catalog includes
`openai-curated-remote`
- extend the existing remote marketplace regression test to cover the
featured IDs response
## Why
When the remote plugin catalog was enabled, app-server loaded
`openai-curated-remote` but skipped `/plugins/featured` because the
request processor only fetched featured IDs for the local
`openai-curated` marketplace. As a result, the desktop app could not
render the backend-curated remote featured set.
This keeps the existing local behavior and also returns the curated
ranking for remote plugins.
## Test plan
- `just fmt`
- `git diff --check`
- `just test -p codex-app-server
plugin_list_includes_remote_marketplaces_when_remote_plugin_enabled`
bf7148626b