A big tidy up of the env #36

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OliverWoolland wants to merge 41 commits intomainfrom

Commits on Jan 29, 2026

Split .env into scoped env files, begin refactoring services to set appropriate settings directly
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Commits on Feb 6, 2026

Commits on Feb 9, 2026

Move data egress keycloak settings for tre-api
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Commits on Feb 10, 2026

Commits on Feb 11, 2026

Move more submission keycloak to interneal
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Commits on Feb 12, 2026

Commits on Feb 17, 2026