airflowctl ignores `--env`/`AIRFLOW_CLI_ENVIRONMENT` on non-auth commands — always uses production credentials

### Airflow CTL Version Latest stable version ### Airflow CTL Command airflowctl auth login --env staging --api-url <staging-url> --api-token <token>; airflowctl dags list --env staging ### Keyring Backend / Version macOS Keychain (`keyring.backends.macOS.Keyring`) 25.7.0 ### Auth Type Token ### What is the current behaviour? `--env`/`-e` is accepted by every non-auth command (`dags list`, `dags trigger`, `connections list`, etc. — anything routed through `output_command_list` / `ARG_AUTH_ENVIRONMENT`) and parses fine into `args.env`. But it's never actually used. `provide_api_client`'s wrapper only forwards `api_token` to `get_client()`: ```python # airflow-ctl/src/airflowctl/api/client.py def wrapper(*args, **kwargs) -> RT: if "api_client" not in kwargs: api_token = getattr(args[0], "api_token", None) if args else None with get_client(kind=kind, api_token=api_token) as api_client: return func(*args, api_client=api_client, **kwargs) ``` and `get_client()` constructs `Credentials` with no `api_environment`: ```python def get_client(kind=ClientKind.CLI, api_token=None): ... credentials = Credentials(client_kind=kind, api_token=api_token).load() ``` `Credentials.__init__` defaults `api_environment` to `"production"`. Since it's never overridden here, **every non-auth command silently operates against the `production` environment** — reading `production.json` for the API URL and the `api_token_production` keychain entry — no matter what `--env` you pass. `auth login` doesn't go through this path; it builds `Credentials(..., api_environment=args.env)` directly, so login correctly targets the requested environment and stores the token under the right keychain key. The net effect: `auth login --env staging` succeeds and looks correct, but every subsequent command (`dags list --env staging`, etc.) silently talks to `production` instead, using a stale/unrelated production token — surfacing as `{'detail': 'Token Expired'}` or `{'detail…