Feature add n8 n (#1468)

* feat(n8n): 添加n8n工作流API支持

添加n8n工作流API作为新的运行器类型，支持通过webhook调用n8n工作流，并提供多种认证方式（Basic、JWT、Header）。新增N8nAuthFormComponent用于处理n8n认证表单联动，并更新相关配置文件和测试用例。

* chore: remove pip mirror url

* perf: simplify ret def of pipeline metadata

* feat(n8n): raise exc instead of ret as normal msg

* perf: add var `user_message_text`

* chore(n8n): migration and default config

* chore: required database version

---------

Co-authored-by: hengwei.wang <@>
Co-authored-by: Junyan Qin <rockchinq@gmail.com>

pkg/persistence/migrations/dbm002_combine_quote_msg_config.py

@@ -28,7 +28,12 @@ class DBMigrateCombineQuoteMsgConfig(migration.DBMigration):
             await self.ap.persistence_mgr.execute_async(
                 sqlalchemy.update(persistence_pipeline.LegacyPipeline)
                 .where(persistence_pipeline.LegacyPipeline.uuid == serialized_pipeline['uuid'])
-                .values({'config': config, 'for_version': self.ap.ver_mgr.get_current_version()})
+                .values(
+                    {
+                        'config': config,
+                        'for_version': self.ap.ver_mgr.get_current_version(),
+                    }
+                )
             )
 
     async def downgrade(self):