fix: 尝试去修复后端无法停止扫描数码管的问题

src/utils/signalR/TypedSignalR.Client/server.Hubs.ts

@@ -20,7 +20,7 @@ export type IDigitalTubesHub = {
     */
     setFrequency(frequency: number): Promise<boolean>;
     /**
-    * @returns Transpiled from System.Threading.Tasks.Task<server.Hubs.DigitalTubeTaskStatus>
+    * @returns Transpiled from System.Threading.Tasks.Task<server.Hubs.DigitalTubeTaskStatus?>
     */
     getStatus(): Promise<DigitalTubeTaskStatus>;
 }