Fix import order and migration down_revision

Reordered the import of file_manager in agent_node.py for consistency. Updated the down_revision in the migration script to reference the correct previous migration.

api/core/workflow/nodes/agent/agent_node.py

@@ -7,10 +7,10 @@ from packaging.version import Version
 from sqlalchemy import select
 from sqlalchemy.orm import Session
 
-from core.file import file_manager
 from core.agent.entities import AgentToolEntity
 from core.agent.plugin_entities import AgentStrategyParameter
 from core.agent.strategy.plugin import PluginAgentStrategy
+from core.file import file_manager
 from core.memory.token_buffer_memory import TokenBufferMemory
 from core.model_manager import ModelInstance, ModelManager
 from core.model_runtime.entities import (

api/migrations/versions/2025_07_07_1152-b2a0bfccd123_add_node_file_usage.py

@@ -12,7 +12,7 @@ from sqlalchemy.dialects import postgresql
 
 # revision identifiers, used by Alembic.
 revision = 'b2a0bfccd123'
-down_revision = '0ab65e1cc7fa'
+down_revision = '58eb7bdb93fe'
 branch_labels = None
 depends_on = None