feat: 优化工作流字段化参数配置

- 开始节点固定 user_input 并区分系统入口与自定义参数

- LLM 与知识库节点切换为字段值加上游引用配置

- 单节点调试改为字段预览与上游引用输入模式

easyflow-ui-admin/app/src/views/ai/workflow/WorkflowDesign.vue

@@ -4,6 +4,7 @@ import { useRoute } from 'vue-router';
 
 import { usePreferences } from '@easyflow/preferences';
 import { getOptions, sortNodes } from '@easyflow/utils';
+import { Tinyflow } from '@tinyflow-ai/vue';
 
 import {
   ArrowLeft,
@@ -11,7 +12,6 @@ import {
   Close,
   Promotion,
 } from '@element-plus/icons-vue';
-import { Tinyflow } from '@tinyflow-ai/vue';
 import {
   ElButton,
   ElDrawer,
@@ -37,6 +37,11 @@ import WorkflowSteps from '#/views/ai/workflow/components/WorkflowSteps.vue';
 
 import { getCustomNode } from './customNode/index';
 import nodeNames from './customNode/nodeNames';
+import {
+  createInitialWorkflowData,
+  isWorkflowDataEmpty,
+  normalizeWorkflowStartNodes,
+} from '../../../../../packages/tinyflow-ui/src/utils/workflowNodeFields';
 
 import '@tinyflow-ai/vue/dist/index.css';
 
@@ -348,9 +353,10 @@ async function handleSave(showMsg: boolean = false): Promise<boolean> {
   }
   saveLoading.value = true;
   try {
+    const content = normalizeWorkflowStartNodes(tinyflowRef.value?.getData());
     const res = await api.post('/api/v1/workflow/update', {
       id: workflowId.value,
-      content: tinyflowRef.value?.getData(),
+      content,
     });
     if (res.errorCode === 0 && showMsg) {
       ElMessage.success(res.message);
@@ -365,9 +371,12 @@ async function handleSave(showMsg: boolean = false): Promise<boolean> {
 async function getWorkflowInfo(workflowId: any) {
   return api.get(`/api/v1/workflow/detail?id=${workflowId}`).then((res) => {
     workflowInfo.value = res.data;
-    tinyFlowData.value = workflowInfo.value.content
+    const parsedContent = workflowInfo.value.content
       ? JSON.parse(workflowInfo.value.content)
       : {};
+    tinyFlowData.value = isWorkflowDataEmpty(parsedContent)
+      ? createInitialWorkflowData()
+      : parsedContent;
     syncNavTitle(workflowInfo.value?.title || '');
   });
 }
@@ -406,7 +415,7 @@ async function runCheck(
   stage: WorkflowCheckStage,
   silentPass: boolean = false,
 ) {
-  const content = tinyflowRef.value?.getData();
+  const content = normalizeWorkflowStartNodes(tinyflowRef.value?.getData());
   if (!content) {
     ElMessage.error($t('aiWorkflow.checkContentEmpty'));
     return false;