Merge branch 'v2.4.5' into stable

Fix SMTP relay on AlmaLinux/RHEL: install cyrus-sasl-plain package

Fix fresh install crash: replace plogical imports in installCyberPanel.py

Fix version references: v2.4.5 not v2.4.5-dev

Bump version to 2.4.5

Revert webmail.conf ownership to cyberpanel:cyberpanel

Fix webmail.conf ownership: use lscpd:lscpd instead of cyberpanel:cyberpanel

Fix dovecot-mysql missing on AlmaLinux 9+: use standard packages instead of gf-plus

Improve Sieve: folder dropdown in rules UI, INBOX. prefix fix, robust upgrade regexes

Fix Sieve storage: add home dir to user_query, sieve plugin paths, and mailbox autocreate

Enable Sieve email filtering in install and upgrade for all OS

Security fixes for webmail and emailDelivery apps

Fix emailDelivery page rendering: use httpProc instead of plain render

Fix webmail SSO setup in install and upgrade

Add CyberMail Email Delivery integration