fix: [Application] Import historical version exported application files, import error occurs (#4710)

Author: shaohuzhang1

apps/application/serializers/application.py

@@ -678,7 +678,7 @@ def to_application(application, workspace_id, user_id, update_tool_map, folder_i
                            stt_model_enable=application.get('stt_model_enable'),
                            tts_type=application.get('tts_type'),
                            clean_time=application.get('clean_time'),
-                           file_clean_time=application.get('file_clean_time'),
+                           file_clean_time=application.get('file_clean_time') or 180,
                            file_upload_enable=application.get('file_upload_enable'),
                            file_upload_setting=application.get('file_upload_setting'),
                            )
@@ -987,7 +987,7 @@ def edit(self, instance: Dict, with_valid=True):
                        'stt_model_params_setting',
                        'mcp_enable', 'mcp_tool_ids', 'mcp_servers', 'mcp_source', 'tool_enable', 'tool_ids',
                        'mcp_output_enable', 'application_enable', 'application_ids',
-                       'problem_optimization_prompt', 'clean_time', 'file_clean_time','folder_id']
+                       'problem_optimization_prompt', 'clean_time', 'file_clean_time', 'folder_id']
         for update_key in update_keys:
             if update_key in instance and instance.get(update_key) is not None:
                 application.__setattr__(update_key, instance.get(update_key))