Increase key refresh interval from 2s to 60s

On-demand refresh on cache miss ensures new keys are still picked up
quickly, so polling every 2 seconds is unnecessary.

Author: Nils Bars

ssh-reverse-proxy/src/server.rs

@@ -1088,10 +1088,10 @@ pub async fn run_server(config: Config) -> Result<()> {
         }
     }
 
-    // Spawn background task to periodically refresh keys (every 2 seconds)
+    // Spawn background task to periodically refresh keys (every 60 seconds)
     eprintln!("[SSH-PROXY] run_server: Spawning key refresh task...");
     std::io::stderr().flush().ok();
-    spawn_key_refresh_task(api_client, Arc::clone(&server.valid_keys), 2);
+    spawn_key_refresh_task(api_client, Arc::clone(&server.valid_keys), 60);
 
     // Load host key
     let key_path = &config.server.host_key_path;