feat(campaigns): add governed collaboration thread

src/govoplan_campaign/backend/router.py

@@ -4,6 +4,7 @@ from fastapi import APIRouter
 
 from govoplan_campaign.backend.routes.attachments import router as attachments_router
 from govoplan_campaign.backend.routes.campaigns import router as campaigns_router
+from govoplan_campaign.backend.routes.collaboration import router as collaboration_router
 from govoplan_campaign.backend.routes.delivery import router as delivery_router
 from govoplan_campaign.backend.routes.jobs import router as jobs_router
 from govoplan_campaign.backend.routes.operations import router as operations_router
@@ -17,6 +18,7 @@ router = APIRouter()
 for workflow_router in (
     operations_router,
     campaigns_router,
+    collaboration_router,
     versions_router,
     jobs_router,
     reports_router,