## Why
The standalone `codex-app-server` binary already routed a
`CliConfigOverrides` value into app-server startup, but its own clap
args did not expose the shared `-c/--config` option. That meant
`codex-app-server -c key=value` was rejected before the existing config
override path could run, unlike the main `codex` CLI.
## What Changed
- Flatten `CliConfigOverrides` into `AppServerArgs` in
`codex-rs/app-server/src/main.rs`.
- Pass parsed overrides to `run_main_with_transport_options` instead of
always using `CliConfigOverrides::default()`.
- Add a binary parser test covering both `-c` and `--config` for the
standalone app-server.
## Verification
- `just test -p codex-app-server
app_server_accepts_cli_config_overrides`
The broader `just test -p codex-app-server` run was also attempted. It
compiled and ran 812 tests, with 796 passing, but failed in this local
sandbox on unrelated `sandbox-exec: sandbox_apply: Operation not
permitted` command-exec/turn integration paths and a skills watcher
timeout.
Michael Bolin