feat: invitation accept screen and api

internal/domain/invite/inviteDomain.go

@@ -9,6 +9,8 @@ var ErrEmailHasAccount = errors.New("email already has an account")
 var ErrPendingInvite = errors.New("pending invite already exists")
 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")
 
 const Lifetime = 3 * 24 * time.Hour