Data-center capex to C&I margin and multiple, and the gates that compress both large-MW genset packaging switchgear · enclosures C&I segment · data-center power substrate data-center capex hyperscaler build-out C&I backlog hyperscale demand locked in C&I revenue growth · mix · price up EBITDA margin expands valuation multiple forward re-rate conversion gates order timing slips backlog fails to convert tariff refund reverses margin & multiple both compress