Integrates webmail and emailDelivery apps, mail-server and install/upgrade
paths, cyberpanel_ols 2.7.0-style binaries, and v2.4.5 UI patterns while
preserving v2.5.5-dev behavior (SnappyMail/PUBLIC_ROOT, childPath in
launchChild, hardened downloads and SSH activity modal).
Replace 'systemctl restart dovecot' with 'doveadm reload' in
virtualHostUtilities, mailUtilities, and renew modules. The nightly
backup scheduler, SSL operations, and weekly cert renewal were
forcefully terminating all client sessions. doveadm reload applies
config changes (including updated SSL certs) without dropping
existing connections. upgrade.py is intentionally left unchanged
as full restarts are appropriate during upgrades.
