feat: downgrade page replace key check (#1263)

Joins Update.page and Registration.page in having Replace Key check due
to relation between OS Version & License OS Eligibility

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Introduced an enhanced system validation step during initialization
that verifies key functionality before processing reboot details,
improving system reliability.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

plugin/source/dynamix.unraid.net/usr/local/emhttp/plugins/dynamix.plugin.manager/Downgrade.page

@@ -16,11 +16,13 @@ Tag="upload"
 /**
  * @note icon-update is rotated via CSS in myservers1.php
  */
-
+require_once "$docroot/plugins/dynamix/include/ReplaceKey.php";
 require_once "$docroot/plugins/dynamix.my.servers/include/reboot-details.php";
-// Create an instance of the RebootDetails class
+
+$replaceKey = new ReplaceKey();
+$replaceKey->check();
+
 $rebootDetails = new RebootDetails();
-// Get the current reboot details if there are any
 $rebootDetails->setPrevious();
 
 $serverNameEscaped = htmlspecialchars(str_replace(' ', '_', strtolower($var['NAME'])));