chore: add k8s and docker as service to agent and update logic for ansible deploy

backend/internal/repository/repository.go

@@ -299,6 +299,12 @@ func (r *Repository) MarkRegistrationTokenUsed(token string) error {
 	return nil
 }
 
+// DeleteRegistrationToken deletes a registration token (used for rollback on deployment failure).
+func (r *Repository) DeleteRegistrationToken(token string) error {
+	_, err := r.DB.Exec(`DELETE FROM registration_tokens WHERE token = ?`, token)
+	return err
+}
+
 // ActivateToken activates a user by token value.
 func (r *Repository) ActivateToken(token string) error {
 	result, err := r.DB.Exec(