fix(mcp): use ActionLogFilter for injected default dttm filter

Pydantic v2 rejects a ColumnOperator instance when validating
list[ActionLogFilter] — it requires an exact instance or dict, not
a parent-class instance. The injected 7-day default dttm filter was
created as a plain ColumnOperator, causing every test_list_action_logs_*
call to fail with '1 validation error for ActionLogList'.

Fix: construct the default filter as ActionLogFilter (which is a
subclass of ColumnOperator), so it passes pydantic validation for
ActionLogList.filters_applied: list[ActionLogFilter] and is still
accepted everywhere ColumnOperator is expected.

superset/mcp_service/action_log/tool/list_action_logs.py

@@ -91,7 +91,7 @@ async def list_action_logs(
         has_dttm_filter = any(getattr(f, "col", None) == "dttm" for f in filters)
         if not has_dttm_filter:
             cutoff = (datetime.now(timezone.utc) - timedelta(days=7)).isoformat()
-            default_filter = ColumnOperator(
+            default_filter = ActionLogFilter(
                 col="dttm",
                 opr=ColumnOperatorEnum.gte,
                 value=cutoff,