usestd::sync::Once;staticINIT: Once =Once::new();/// Ensure the rustls crypto provider (ring) is installed.
////// Must be called before creating any reqwest clients. Safe to call
/// multiple times — only the first call installs the provider.
pubfnensure_crypto_provider(){INIT.call_once(||{rustls::crypto::ring::default_provider().install_default().expect("Failed to install rustls crypto provider");});}