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Zhengchao An
7528a0b916
* feat(kms): accept the AWS backend through KMS configuration The AWS KMS backend could be constructed but not selected: the admin configure API had no AWS variant and startup rejected the backend name. The configure request pins the region rather than defaulting it, because that configuration is persisted once and replayed on every node: leaving the region to each node's ambient provider chain would let nodes address different regions, and therefore different keys, while reporting an identical configuration. The request accepts no credential fields, so credentials stay with the aws-config provider chain on each node, and `deny_unknown_fields` refuses attempts to submit them anyway. * test(kms): cover AWS backend selection through the service manager An end-to-end check that an admin configure request selects the AWS backend, builds a client, and passes the startup health check. Marked #[ignore]: it needs real AWS credentials, though it creates no key and is therefore not billable on its own.