fix(server): stop overpricing cached Claude tokens #493

Job	Run time
Prime Background Platform (ubuntu-24.04)	56s
Test Server 1	2m 39s
Release Smoke	1m 6s
Test Server 2	3m 30s
Test Server 3	3m 11s
Desktop Prime Packaged Smoke (win)	6m 34s
Rust	19s
Desktop Prime Packaged Smoke (linux)	3m 18s
Prime Background Platform (windows-2025)	2m 20s
Check	3m 3s
Test	5m 8s
	32m 4s

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