Spring Authorization Server for building OAuth 2.1 and OpenID Connect providers.
USE WHEN: user mentions "OAuth2 server", "authorization server", "OIDC provider", "token endpoint", asks about "how to implement OAuth2", "create authorization server", "issue JWT tokens", "custom OAuth provider"
DO NOT USE FOR: OAuth2 client configuration - use `spring-security` instead, resource server JWT validation - use `spring-security` instead