Install and reconcile module workflow standards

src/govoplan_workflow_engine/backend/router.py

@@ -21,6 +21,7 @@ from govoplan_workflow_engine.backend.governance import (
     require_definition_action,
 )
 from govoplan_workflow_engine.backend.contributions import (
+    compare_workflow_override_to_standard,
     reconcile_workflow_definition_contributions,
     reset_workflow_override_to_standard,
 )
@@ -87,6 +88,7 @@ from govoplan_workflow_engine.backend.schemas import (
     WorkflowNodeLibraryResponse,
     WorkflowNodeTypeResponse,
     WorkflowPortResponse,
+    WorkflowStandardDiffResponse,
     WorkflowStepActionRequest,
 )
 from govoplan_workflow_engine.backend.instance_service import (
@@ -819,6 +821,41 @@ def api_reset_definition_to_standard(
     return response
 
 
+@router.get(
+    "/definitions/{definition_id}/standard-diff",
+    response_model=WorkflowStandardDiffResponse,
+)
+def api_compare_definition_to_standard(
+    definition_id: str,
+    include_unchanged: bool = False,
+    session: Session = Depends(get_session),
+    principal: ApiPrincipal = Depends(get_api_principal),
+) -> WorkflowStandardDiffResponse:
+    _require_any_scope(principal, DEFINITION_READ_SCOPE, ADMIN_SCOPE)
+    try:
+        definition = get_definition(
+            session,
+            tenant_id=principal.tenant_id,
+            definition_id=definition_id,
+        )
+        require_definition_action(
+            definition,
+            principal=principal,
+            registry=get_registry(),
+            action="view",
+        )
+        return compare_workflow_override_to_standard(
+            session,
+            tenant_id=principal.tenant_id,
+            definition_id=definition_id,
+            include_unchanged=include_unchanged,
+        )
+    except PermissionError as exc:
+        raise _governance_http_error(exc) from exc
+    except WorkflowError as exc:
+        raise _http_error(exc) from exc
+
+
 @router.get(
     "/instances/{instance_id}",
     response_model=WorkflowInstanceResponse,