fix: install rustls CryptoProvider at startup to prevent panic under load

src/main.rs

@@ -48,6 +48,9 @@ struct Cli {
 
 #[tokio::main]
 async fn main() {
+    // Install rustls CryptoProvider early — prevents panic under concurrent load
+    let _ = rustls::crypto::ring::default_provider().install_default();
+
     let cli = Cli::parse();
 
     // Flag > env var > default (warn)