[router] Worker Management Workflow Engine (#11868)

sgl-router/tests/common/test_app.rs

@@ -53,8 +53,9 @@ pub fn create_test_app(
         router_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());
 
     // Create AppContext
     let app_context = Arc::new(AppContext::new(
@@ -71,6 +72,7 @@ pub fn create_test_app(
         conversation_item_storage,
         load_monitor,
         worker_job_queue,
+        workflow_engine,
     ));
 
     // Create AppState with the test router and context