feat(agents): align create name defaults

internal/repository/agent_repo.go

@@ -142,6 +142,12 @@ func (r *AgentRepo) CreateAgent(ctx context.Context, accountID uint, inviterID u
 	err := r.db.WithContext(ctx).Where("email = ?", email).First(&user).Error
 	if err == gorm.ErrRecordNotFound {
 		// Create new user
+		if name == "" {
+			name = email
+			if atIdx := indexOfAt(email); atIdx > 0 {
+				name = email[:atIdx]
+			}
+		}
 		user = model.User{
 			Name:     name,
 			Email:    email,