[router] Add rustfmt and set group imports by default (#11732)

sgl-router/src/protocols/worker_spec.rs

@@ -2,9 +2,10 @@
 //!
 //! Defines the request/response structures for worker management endpoints
 
-use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 
+use serde::{Deserialize, Serialize};
+
 /// Worker configuration for API requests
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct WorkerConfigRequest {