feat(server): add isolated Prime background writing #483

Job	Run time
Prime Background Platform (windows-2025)	2m 11s
Desktop Prime Packaged Smoke (linux)	1m 59s
Test Server 2	3m 23s
Test Server 3	3m 16s
Release Smoke	1m 10s
Check	3m 4s
Desktop Prime Packaged Smoke (win)	6m 8s
Prime Background Platform (ubuntu-24.04)	56s
Test Server 1	2m 41s
Test	4m 53s
Rust	25s
	30m 6s

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