feat: 文件导出适配 base file server

lib/tallty_import_export/export.rb

@@ -281,7 +281,7 @@ module TalltyImportExport
       when 'file'
         if data.is_a?(Array) && !opts[:keep_array]
           data.map do |item|
-            url = item.dig('url')
+            url = item.dig('url') || item.dig('downloadPath')
             url.present? ?
               "#{url}?fileName=#{URI.encode_www_form_component(item.dig('fileName'))}&fileSize=#{URI.encode_www_form_component(item.dig('fileSize'))}&mimeType=#{URI.encode_www_form_component(item.dig('mimeType') || item.dig('fileType'))}" :
               nil