Ящики: минимальная длина пароля 8 (как при регистрации и смене пароля), было 10

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

backend/src/main/java/com/mailserver/controller/MailboxAdminController.java

@@ -43,7 +43,7 @@ public class MailboxAdminController {
 
     private static final Logger log = LoggerFactory.getLogger(MailboxAdminController.class);
     private static final Pattern LOCAL_PART = Pattern.compile("[a-z0-9](?:[a-z0-9._+-]{0,62}[a-z0-9])?");
-    private static final int MIN_PASSWORD = 10;
+    private static final int MIN_PASSWORD = 8;
 
     public record MailboxView(Long id, String email, String displayName, boolean active, boolean admin,
                               long usedBytes, long quotaBytes, Instant createdAt) {