Fix ORDER BY with named aggregates that expand to subqueries#34
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Fixes #28.
When an expanded AGGREGATE ... AT SELECT alias contains a scalar subquery, DuckDB can order by the alias directly but fails when that alias is referenced inside a complex ORDER BY expression such as revenue / year_total.
This rewrites those complex ORDER BY expressions through the DuckDB parser by inlining SELECT aliases only when the expression references a subquery-backed alias. Simple ORDER BY year_total and qualified tie-breakers stay in the original query scope.
Tests added for the original ratio sort, qualified tie-breakers, and simple alias ordering.