Enhance CORS configuration and WebSocket origin settings to include additional localhost ports. Improve error handling in SftpController and SftpView for better debugging and user feedback.

frontend/src/views/SftpView.vue

@@ -58,7 +58,8 @@ function initPath() {
     currentPath.value = p || '.'
     pathParts.value = p === '/' ? [''] : p.split('/').filter(Boolean)
     loadPath()
-  }).catch(() => {
+  }).catch((err: { response?: { data?: { error?: string } } }) => {
+    error.value = err?.response?.data?.error ?? '获取当前路径失败，请检查连接与认证'
     currentPath.value = '.'
     pathParts.value = []
     loadPath()
@@ -76,8 +77,8 @@ function loadPath() {
         return a.name.localeCompare(b.name)
       })
     })
-    .catch(() => {
-      error.value = '获取文件列表失败'
+    .catch((err: { response?: { data?: { error?: string } } }) => {
+      error.value = err?.response?.data?.error ?? '获取文件列表失败'
     })
     .finally(() => {
       loading.value = false