test: update user service stubs for identity summaries

backend/internal/service/billing_cache_service_singleflight_test.go

@@ -86,6 +86,10 @@ func (s *balanceLoadUserRepoStub) GetByID(ctx context.Context, id int64) (*User,
 	return &User{ID: id, Balance: s.balance}, nil
 }
 
+func (s *balanceLoadUserRepoStub) ListUserAuthIdentities(context.Context, int64) ([]UserAuthIdentityRecord, error) {
+	return nil, nil
+}
+
 func TestBillingCacheServiceGetUserBalance_Singleflight(t *testing.T) {
 	cache := &billingCacheMissStub{}
 	userRepo := &balanceLoadUserRepoStub{

backend/internal/service/user_service_test.go

@@ -100,6 +100,9 @@ func (m *mockUserRepo) RemoveGroupFromAllowedGroups(context.Context, int64) (int
 	return 0, nil
 }
 func (m *mockUserRepo) AddGroupToAllowedGroups(context.Context, int64, int64) error { return nil }
+func (m *mockUserRepo) ListUserAuthIdentities(context.Context, int64) ([]UserAuthIdentityRecord, error) {
+	return nil, nil
+}
 func (m *mockUserRepo) UpdateTotpSecret(context.Context, int64, *string) error { return nil }
 func (m *mockUserRepo) EnableTotp(context.Context, int64) error                { return nil }
 func (m *mockUserRepo) DisableTotp(context.Context, int64) error               { return nil }