perf(模型工具类): 优化模型工具获取开始节点方法。

ruoyi-flowable/src/main/java/com/ruoyi/flowable/utils/ModelUtils.java

@@ -44,8 +44,11 @@ public class ModelUtils {
      */
     public static StartEvent getStartEvent(BpmnModel model) {
         Process process = model.getMainProcess();
-        Collection<FlowElement> flowElements = process.getFlowElements();
+        FlowElement startElement = process.getInitialFlowElement();
-        return getStartEvent(flowElements);
+        if (startElement instanceof StartEvent) {
+            return (StartEvent) startElement;
+        }
+        return getStartEvent(process.getFlowElements());
     }
 
     /**