fix: enhance validation for required form fields

--bug=1052705 --user=刘瑞斌 【工作流】添加”开关”按钮参数， 默认值为关闭，保存之后页面还会提示“请填写所填字段” https://www.tapd.cn/57709429/s/1675323

Author: liuruibin

ui/src/components/ai-chat/component/user-form/index.vue

@@ -303,7 +303,9 @@ const checkInputParam = () => {
   for (let i = 0; i < inputFieldList.value.length; i++) {
     if (
       inputFieldList.value[i].required &&
-      !form_data_context.value[inputFieldList.value[i].field]
+      (form_data_context.value[inputFieldList.value[i].field] === null ||
+        form_data_context.value[inputFieldList.value[i].field] === undefined ||
+        form_data_context.value[inputFieldList.value[i].field] === '')
     ) {
       MsgWarning(t('chat.tip.requiredMessage'))
       return false