Use schedule to send QR code Email of OTP third-party key instead of send all Email one time

Add my process to crontab to run the process every 1 mins
Create config file for send Email process (send_otp_qrcode.php)

The files are in /tmp

The status is:

create: New email added or use want to resend again

resend: The batch is reached (100 emails for example), and this email is 101 or over 100, then set it to resend.

send: The email is sent, no need to send again.

The numbers meaning:

    const RETRY_INTERVAL = 120; // seconds (One account can send OTP only once in this interval)

    const EXPIRE_INTERVAL = 86400; // seconds (If this email keep not sent or resend in 1 day, then just remove it.)

    const SEND_COMPLETE_EXPIRE = 1200; // seconds (After this time, the sent OTP will be considered expired.)

    const MAX_RETRY = 3; // If the email retry 3 times and still failed, then remove from config file.

    const BATCH_SIZE = 100; // Number of accounts to process in one batch, that means you can send 100 emails in schedule, and then remain emails should wait for next schedule.
The PHP for process to be executed by crontab, and the mechanism is in Flowchart (Flow chart for schedule function).

I also write log to debug the process.
There is background execute issue if I only call CLI, so I send output to /tmp/backend_mail.
The log format is:

[DEBUG][{date_time}] Send OTP QR Code Email to: {my_email}, for account: {my_account} [{my_shell_id}] [{my_vsite_name}]

Such as:

[DEBUG][2025-08-06 07:12:01] Send OTP QR Code Email to: aaa@test.com, for account: bbb [array] [localdb]
Because the function is changed, I rename the function and modified the code for 

class.cliWrap_vLocalDBAccounts.php

You can check the logic in Flowchart (Flow chart for schedule settings)