fix: add stream close check, recover regression test assertions, and secure credentials type check

frontend/src/views/Websites.vue

@@ -1986,6 +1986,7 @@ async function triggerSyncUpstreamModels() {
   syncModelsDialog.value = true
 
   let hasProcessedStart = false
+  let gotComplete = false
 
   try {
     const authStore = useAuthStore()
@@ -2040,6 +2041,7 @@ async function triggerSyncUpstreamModels() {
           syncModelsResults.value.push(data)
         } else if (event === 'complete') {
           syncModelsMessage.value = data.message
+          gotComplete = true
           if (data.success) {
             ElMessage.success('同步完成')
           } else {
@@ -2061,6 +2063,7 @@ async function triggerSyncUpstreamModels() {
         syncModelsResults.value.push(data)
       } else if (event === 'complete') {
         syncModelsMessage.value = data.message
+        gotComplete = true
         if (data.success) {
           ElMessage.success('同步完成')
         } else {
@@ -2070,6 +2073,10 @@ async function triggerSyncUpstreamModels() {
         throw new Error(data.message || '流式同步出错')
       }
     }
+
+    if (!gotComplete) {
+      throw new Error('同步流异常中断，未获取到完整执行报告')
+    }
   } catch (e: any) {
     ElMessage.error(e.message || '同步上游模型失败')
     if (!hasProcessedStart || syncModelsResults.value.length === 0) {