fix(upload): 响应式更新上传项以恢复外部保存按钮。

web-admin/src/components/business/attachment-upload-field/index.vue

@@ -535,13 +535,13 @@ async function uploadRawFile(rawFile: File) {
     return false
   }
 
-  const item: AttachmentItem = {
+  const item = reactive<AttachmentItem>({
     id: `upload-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
     fileName: rawFile.name,
     fileUrl: '',
     fileType: rawFile.type,
     _uploading: true
-  }
+  })
   attachments.value.push(item)
 
   const formData = props.bizType