refactor: replace direct calls to provisioning functions with OpenClawProvisioningService methods

backend/app/api/board_groups.py

@@ -30,7 +30,7 @@ from app.schemas.pagination import DefaultLimitOffsetPage
 from app.schemas.view_models import BoardGroupSnapshot
 from app.services.board_group_snapshot import build_group_snapshot
 from app.services.openclaw.constants import DEFAULT_HEARTBEAT_CONFIG
-from app.services.openclaw.provisioning import sync_gateway_agent_heartbeats
+from app.services.openclaw.provisioning import OpenClawProvisioningService
 from app.services.openclaw.shared import GatewayTransportError
 from app.services.organizations import (
     OrganizationContext,
@@ -269,7 +269,10 @@ async def _sync_gateway_heartbeats(
             failed_agent_ids.extend([agent.id for agent in gateway_agents])
             continue
         try:
-            await sync_gateway_agent_heartbeats(gateway, gateway_agents)
+            await OpenClawProvisioningService().sync_gateway_agent_heartbeats(
+                gateway,
+                gateway_agents,
+            )
         except GatewayTransportError:
             failed_agent_ids.extend([agent.id for agent in gateway_agents])
     return failed_agent_ids