enhance invitation feature with email notifications and referral links

[JisanAR03]

Invitation System Description

The invitation system is designed to reward users who invite others to join the platform. Here's how it works:

1. Referral Tracking:

   • When a new user clicks on an invitation link, the referral code is stored in their session. This functionality has already been implemented.
   • Using the session data, the system identifies the inviter and assigns points to them once the invited user successfully signs up.

2. Email Invitations:

   • The API has been updated to send referral links directly to new users via email.
   • The emailed referral link is now functional, valid, and fully integrated into the signup process.

This setup ensures seamless tracking of referrals and proper point allocation to the inviter. 🎉

@DonnieBLT sir , can you please review this pr ?

this is a sentry , but for pass github action " fix #2972"