devfront ID Token Claims 백엔드 반영

backend/internal/domain/hydra_models.go

@@ -11,6 +11,7 @@ const (
 	MetadataHeadlessJWKSURI                 = "headless_jwks_uri"
 	MetadataHeadlessJWKS                    = "headless_jwks"
 	MetadataRequestObjectSigningAlg         = "request_object_signing_alg"
+	MetadataIDTokenClaims                   = "id_token_claims"
 	MetadataAutoLoginSupported              = "auto_login_supported"
 	MetadataAutoLoginURL                    = "auto_login_url"
 )