feat: 数据处理向导默认数据类型改为结构化

创建页 processType 默认值与草稿恢复兜底由非结构化调整为结构化，更贴合主流使用场景。

frontend/src/views/data-process/create/useDataProcessDraft.ts

@@ -94,9 +94,9 @@ export function useDataProcessDraft(bindings: DraftBindings) {
       bindings.goToStep('create')
       bindings.task.name = snapshot.task?.name || ''
       bindings.task.description = snapshot.task?.description || ''
-      bindings.processType.value = snapshot.processType === 'structured' || snapshot.processType === 'external'
+      bindings.processType.value = snapshot.processType === 'unstructured' || snapshot.processType === 'external'
         ? snapshot.processType
-        : 'unstructured'
+        : 'structured'
 
       if (snapshot.structuredOptions) {
         bindings.structuredOptions.value = {