feat: add content sync task plugin, fix countdown, CB tables, remove workflows (02.28.00)

- Add plg_task_mokowaassync scheduled task plugin for automated content sync
- Fix demo banner countdown to show weeks/days/months for longer intervals
- Add Community Builder tables to DemoResetService safe reset list
- Remove all CI/CD workflow files (manual release process)
- Bump version to 02.28.00 across all manifests and updates.xml

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

src/script.php

@@ -40,6 +40,7 @@ class Pkg_MokowaasInstallerScript
 		$this->enablePlugin('system', 'mokowaas');
 		$this->enablePlugin('webservices', 'mokowaas');
 		$this->enablePlugin('task', 'mokowaasdemo');
+		$this->enablePlugin('task', 'mokowaassync');
 
 		// Mark MokoWaaS extensions as protected (prevents disable/uninstall at framework level)
 		$this->protectExtensions();
@@ -196,6 +197,7 @@ class Pkg_MokowaasInstallerScript
 				$db->quote('mokowaas'),
 				$db->quote('com_mokowaas'),
 				$db->quote('mokowaasdemo'),
+				$db->quote('mokowaassync'),
 				$db->quote('perfectpublisher'),
 			];