feat(authserver): add OAuth 2.0 client_credentials grant support for M2M clients#3962

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RobertWi wants to merge 8 commits intostacklok:mainfrom

RobertWi:feat/client-credentials-grant

Commits on Mar 2, 2026

feat(authserver): wire client_credentials grant factory into fosite provider
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feat(dcr): support confidential client registration for client_credentials
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feat(dcr): generate and return client_secret for confidential clients
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feat(token): populate session subject for client_credentials grant
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feat(discovery): advertise client_credentials and client_secret_basic
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test(dcr): add confidential client validation tests
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test(handlers): add client_credentials token and discovery tests
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test(integration): add client_credentials grant flow tests
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