Function get_api_key_with_mode 

pub fn get_api_key_with_mode(
    provider: &str,
    _sources: &ApiKeySources,
    storage_mode: AuthCredentialsStoreMode,
) -> Result<String>

Get an API key using the configured secure-storage backend.

Environment variables remain the highest-priority source. Secure storage is read with storage_mode so a key written to an explicitly configured backend is resolved from that same backend on every startup.