Add jobs to send email reminders and expire tokens

[dkhalife]

No description provided.

[Copilot]

PR Overview

This PR adds functionality for sending email reminders for expiring app tokens and cleaning up expired tokens. Key changes include:

• Introducing a new AppTokenCleaner service in the housekeeper package with methods to send token expiration reminders and perform token cleanup.
• Extending the UserRepository with methods to fetch tokens nearing expiration and delete stale tokens.
• Updating configuration files, scheduler, and README to support the new token-related jobs.

Reviewed Changes

File	Description
internal/services/housekeeper/app_tokens.go	Adds AppTokenCleaner with SendTokenExpirationReminder and CleanupExpiredTokens methods
internal/repos/user/user.go	Adds methods for retrieving nearing expiration tokens and deleting stale tokens
internal/utils/email/email.go	Adds SendTokenExpirationReminder to generate email notifications
config/*	Updates configs and README to include token expiration reminder settings
internal/services/scheduler/scheduler.go	Adds scheduler jobs for token expiration reminder and cleanup

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.