chore: resolve clippy warnings for pre-push audit

server/src/router.rs

@@ -1398,7 +1398,7 @@ mod tests {
         let handler = MemoryHandler::new(state);
 
         // 1. Verify invalid LLM requests fail gracefully with isError: true or structured response
-        for (tool_name, _tool) in &handler.tools {
+        for tool_name in handler.tools.keys() {
             let invalid_req = json!({
                 "jsonrpc": "2.0",
                 "id": 200,