refactor: simplify code formatting and improve readability across multiple files

backend/app/api/board_memory.py

@@ -24,11 +24,7 @@ from app.core.time import utcnow
 from app.db.pagination import paginate
 from app.db.session import async_session_maker, get_session
 from app.integrations.openclaw_gateway import GatewayConfig as GatewayClientConfig
-from app.integrations.openclaw_gateway import (
-    OpenClawGatewayError,
-    ensure_session,
-    send_message,
-)
+from app.integrations.openclaw_gateway import OpenClawGatewayError, ensure_session, send_message
 from app.models.agents import Agent
 from app.models.board_memory import BoardMemory
 from app.models.gateways import Gateway