fix: config Dovecot 2.4 (dovecot_config_version + nouvelle syntaxe passdb/userdb)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

install.sh

@@ -156,22 +156,29 @@ chown root:dovecot /etc/dovecot/users
 chmod 640 /etc/dovecot/users
 
 cat > /etc/dovecot/dovecot.conf << DOVECOT
+dovecot_config_version = 2.4.0
+dovecot_storage_version = 2.4.0
+
 protocols = imap
 listen = *
 
-mail_location = maildir:/var/mail/vhosts/%d/%n/Maildir
+mail_location = maildir:/var/mail/vhosts/%{domain}/%{username}/Maildir
 mail_privileged_group = vmail
 
 auth_mechanisms = plain login
+auth_allow_cleartext = yes
 
-passdb {
-  driver = passwd-file
-  args = scheme=SHA512-CRYPT /etc/dovecot/users
+passdb passwd-file {
+  default_password_scheme = SHA512-CRYPT
+  passwd_file_path = /etc/dovecot/users
 }
 
-userdb {
-  driver = static
-  args = uid=vmail gid=vmail home=/var/mail/vhosts/%d/%n
+userdb static {
+  fields {
+    uid = vmail
+    gid = vmail
+    home = /var/mail/vhosts/%{domain}/%{username}
+  }
 }
 
 service imap-login {