[router] Worker Management Workflow Engine (#11868)

sgl-router/tests/test_pd_routing.rs

@@ -238,8 +238,9 @@ mod test_pd_routing {
                     config.worker_startup_check_interval_secs,
                 )));
 
-                // Create empty OnceLock for worker job queue
+                // Create empty OnceLock for worker job queue and workflow engine
                 let worker_job_queue = Arc::new(OnceLock::new());
+                let workflow_engine = Arc::new(OnceLock::new());
 
                 Arc::new(sglang_router_rs::server::AppContext::new(
                     config,
@@ -255,6 +256,7 @@ mod test_pd_routing {
                     conversation_item_storage,
                     load_monitor,
                     worker_job_queue,
+                    workflow_engine,
                 ))
             };
             let result = RouterFactory::create_router(&app_context).await;