Warn user if Sse addr is 0.0.0.0 (#15)

* warn user if sse addr is 0.0.0.0

* [autofix.ci] apply automated fixes

* feat: show url if not able to connect to server

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

Author: thesapan

crates/gpmcp-layer-core/src/runner/transport_manager.rs

@@ -95,12 +95,10 @@ impl TransportManager {
                     info!("Server is ready after {} attempts", attempt);
                     return Ok(());
                 }
-                Err(e) => {
+                Err(_) => {
                     if attempt == max_attempts {
                         return Err(anyhow::anyhow!(
-                            "Server not ready after {} attempts. Last error: {}",
-                            max_attempts,
-                            e
+                            "Cannot connect to {url}. Server not ready after {max_attempts} attempts."
                         ));
                     }
                     // Wait before next attempt