refactor: rename MokoJoomOpenGraph -> MokoSuiteOpenGraph; require Joomla 6+

Product rename (display name / docs / comments / language strings only —
technical element names mokoog/com_mokoog/MokoOG namespace unchanged):
- Replace "MokoJoom" -> "MokoSuite" across 55 files
- Fixes the update-site license lookup in script.php, which matched the
  old "%MokoJoomOpenGraph%" name and would never find a "MokoSuite" site

Joomla 6 compatibility:
- script.php: minimumJoomla 4.0.0 -> 6.0.0, minimumPhp 8.1.0 -> 8.2.0,
  and actually enforce the Joomla floor in preflight() (was PHP-only)
- Add PKG_MOKOOG_JOOMLA_VERSION_ERROR language strings (en-GB, en-US)
- openapi.yaml + README state Joomla 6.0+ requirement
- Audit confirmed the codebase already uses only Joomla-6-supported APIs

(cherry picked from commit 7fb7e38762)

source/script.php

@@ -1,7 +1,7 @@
 <?php
 
 /**
- * @package     MokoJoomOpenGraph
+ * @package     MokoSuiteOpenGraph
  * @author      Moko Consulting <hello@mokoconsulting.tech>
  * @copyright   Copyright (C) 2026 Moko Consulting. All rights reserved.
  * @license     GNU General Public License version 3 or later; see LICENSE
@@ -15,8 +15,8 @@ use Joomla\CMS\Language\Text;
 
 class Pkg_MokoOGInstallerScript
 {
-	protected $minimumJoomla = '4.0.0';
-	protected $minimumPhp = '8.1.0';
+	protected $minimumJoomla = '6.0.0';
+	protected $minimumPhp = '8.2.0';
 
 	
 	
@@ -33,6 +33,16 @@ class Pkg_MokoOGInstallerScript
 			return false;
 		}
 
+		if (version_compare(JVERSION, $this->minimumJoomla, '<'))
+		{
+			Factory::getApplication()->enqueueMessage(
+				Text::sprintf('PKG_MOKOOG_JOOMLA_VERSION_ERROR', $this->minimumJoomla),
+				'error'
+			);
+
+			return false;
+		}
+
 		$this->saveDownloadKey();
 
 		return true;
@@ -128,7 +138,7 @@ class Pkg_MokoOGInstallerScript
 				$db->getQuery(true)
 					->select([$db->quoteName('update_site_id'), $db->quoteName('extra_query')])
 					->from($db->quoteName('#__update_sites'))
-					->where('(' . $db->quoteName('name') . ' LIKE ' . $db->quote('%MokoJoomOpenGraph%') . ' OR ' . $db->quoteName('location') . ' LIKE ' . $db->quote('%MokoJoomOpenGraph%') . ')')
+					->where('(' . $db->quoteName('name') . ' LIKE ' . $db->quote('%MokoSuiteOpenGraph%') . ' OR ' . $db->quoteName('location') . ' LIKE ' . $db->quote('%MokoSuiteOpenGraph%') . ')')
 					->setLimit(1)
 			);
 			$site = $db->loadObject();