feat: invite management API: DELETE /v1/user/invite/:id (204, cancels a pending invite) and POST /v1/user/invite/:id/renew (200, new code, expires_at = now+3d, created_at = now, resends the invitation email, old link dead)

internal/domain/invite/inviteDomain.go

@@ -11,6 +11,7 @@ var ErrInviteNotFound = errors.New("invite not found")
 var ErrInviteEmailNotSent = errors.New("invite email not sent")
 var ErrInviteInvalid = errors.New("invite invalid")
 var ErrInviteExpired = errors.New("invite expired")
+var ErrInviteAlreadyAccepted = errors.New("invite already accepted")
 
 const Lifetime = 3 * 24 * time.Hour