feat: add scheduled tasks, individual fields, remote storage

- Add plg_task_mokobackup: Joomla Scheduled Tasks integration so each
  backup profile can run on its own schedule (like Akeeba Backup Pro)
- Replace JSON config/filters with individual form fields and DB columns
- Add FTP/FTPS and Google Drive remote storage options per profile
- Add archive settings tab (format, compression, split size, backup dir)
- Add exclusion filter fields (dirs, files, tables) as newline-separated
  textareas instead of raw JSON

Authored-by: Moko Consulting
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/script.php

@@ -74,6 +74,17 @@ class Pkg_MokoBackupInstallerScript
 			$db->setQuery($query);
 			$db->execute();
 
+			// Enable the task plugin automatically
+			$query = $db->getQuery(true)
+				->update($db->quoteName('#__extensions'))
+				->set($db->quoteName('enabled') . ' = 1')
+				->where($db->quoteName('type') . ' = ' . $db->quote('plugin'))
+				->where($db->quoteName('folder') . ' = ' . $db->quote('task'))
+				->where($db->quoteName('element') . ' = ' . $db->quote('mokobackup'));
+
+			$db->setQuery($query);
+			$db->execute();
+
 			// Enable the webservices plugin automatically
 			$query = $db->getQuery(true)
 				->update($db->quoteName('#__extensions'))