refactor: enforce architectural boundaries by updating OpenClaw service imports

backend/app/api/board_memory.py

@@ -23,14 +23,14 @@ from app.core.config import settings
 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
 from app.models.agents import Agent
 from app.models.board_memory import BoardMemory
 from app.schemas.board_memory import BoardMemoryCreate, BoardMemoryRead
 from app.schemas.pagination import DefaultLimitOffsetPage
 from app.services.mentions import extract_mentions, matches_agent_mention
 from app.services.openclaw.shared import (
+    GatewayClientConfig,
+    GatewayTransportError,
     optional_gateway_config_for_board,
     send_gateway_agent_message,
 )
@@ -124,7 +124,7 @@ async def _send_control_command(
                 message=command,
                 deliver=True,
             )
-        except OpenClawGatewayError:
+        except GatewayTransportError:
             continue
 
 
@@ -215,7 +215,7 @@ async def _notify_chat_targets(
                 agent_name=agent.name,
                 message=message,
             )
-        except OpenClawGatewayError:
+        except GatewayTransportError:
             continue