refactor: replace Joomla-7-deprecated APIs (forward compatibility)

Removes accessors deprecated in Joomla 5 and slated for removal in 7
(extension already runs on 6; this future-proofs for 7):
- Factory::getDbo() -> Factory::getContainer()->get(DatabaseInterface::class)
  across plugins, controllers, static helpers, and the install script
- Factory::getUser() -> Factory::getApplication()->getIdentity()
- Factory::getSession() -> Factory::getApplication()->getSession()
- jexit(Text::_('JINVALID_TOKEN')) -> throw new \RuntimeException(..., 403),
  consistent with the access-denied checks already in those controllers

Note: SQL update-version concern is already resolved — the release bumped
to 01.05.00, which matches the 01.05.00.sql update slot.

source/packages/com_mokoog/src/Controller/ImportExportController.php

@@ -36,14 +36,14 @@ class ImportExportController extends BaseController
      */
     public function export(): void
     {
-        Session::checkToken('get') || jexit(Text::_('JINVALID_TOKEN'));
+        Session::checkToken('get') || throw new \RuntimeException(Text::_('JINVALID_TOKEN'), 403);
 
         if (!Factory::getApplication()->getIdentity()->authorise('core.manage', 'com_mokoog')) {
             throw new \RuntimeException(Text::_('JLIB_APPLICATION_ERROR_ACCESS_FORBIDDEN'), 403);
         }
 
         $app = Factory::getApplication();
-        $db  = Factory::getDbo();
+        $db  = Factory::getContainer()->get(\Joomla\Database\DatabaseInterface::class);
 
         // Join with #__content to get article titles for reference
         $query = $db->getQuery(true)
@@ -102,7 +102,7 @@ class ImportExportController extends BaseController
      */
     public function import(): void
     {
-        Session::checkToken() || jexit(Text::_('JINVALID_TOKEN'));
+        Session::checkToken() || throw new \RuntimeException(Text::_('JINVALID_TOKEN'), 403);
 
         $identity = Factory::getApplication()->getIdentity();
 
@@ -161,7 +161,7 @@ class ImportExportController extends BaseController
             return;
         }
 
-        $db      = Factory::getDbo();
+        $db      = Factory::getContainer()->get(\Joomla\Database\DatabaseInterface::class);
         $header  = fgetcsv($handle);
         $created = 0;
         $updated = 0;