The supported-scope list lived on OidcController, so the device authorization
controller (and a test) had to reach across into OidcController::SUPPORTED_SCOPES.
Move it to a shared OidcScopes::SUPPORTED module — one source of truth for the
OIDC controller, the device flow, and consent handling — and update every
reference. No behavior change.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016Q4ATZHoMCWqvSpE2yYoie
