fix: update file handling in base_document_extract_node.py to use image metadata

--bug=1058385 --user=刘瑞斌 【应用】文档内容提取节点提取文档失败 https://www.tapd.cn/62980211/s/1727581

Author: liuruibin

apps/application/flow/step_node/document_extract_node/impl/base_document_extract_node.py

@@ -61,9 +61,9 @@ def save_image(image_list):
                     'application_id': str(application.id) if application.id else None,
                     'file_id': str(image.id)
                 }
-                file = bytes_to_uploaded_file(image.image, image.image_name)
+                f = bytes_to_uploaded_file(image.meta['content'], image.file_name)
                 FileSerializer(data={
-                    'file': file,
+                    'file': f,
                     'meta': meta,
                     'source_id': meta['application_id'],
                     'source_type': FileSourceType.APPLICATION.value