feat: add SCIM 2.0 user provisioning (EE)

[brendan-kellam]

Adds a SCIM 2.0 server (EE, gated by the new scim entitlement) so an identity provider (Okta, Entra) can provision and deprovision Sourcebot members.

Scope

• /scim/v2 Users endpoints: discovery, list+filter, create, get, replace, PATCH (active toggle), delete. Groups deferred.
• Deprovisioning soft-deactivates the membership (new UserToOrg.isActive): forces logout via sessionVersion and revokes API/OAuth tokens, but preserves the row so the IdP can reactivate.
• Org-scoped ScimToken (bearer auth via withScimAuth); managed under Settings → Security.
• JIT auto-join is suppressed once SCIM is enabled (IdP is the source of truth).

Note: the scim entitlement must be added to the lighthouse entitlements list and deployed before online licenses will grant it.

🤖 Generated with Claude Code

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch brendan/scim-user-provisioning

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