Refactor engine structure: remove legacy files and introduce new architecture

- Deleted legacy model.php, proxy.php, registry.php, and router.php files.
- Added new action.php, controller.php, event.php, loader.php, model.php, proxy.php, registry.php, and router.php files to implement a more modular and maintainable structure.
- Introduced an event-driven architecture for better extensibility.
- Updated loader functionality to handle controllers, models, views, libraries, helpers, and configurations.
- Ensured compatibility with OpenCart standards and improved error handling.
- Created a new DDEV configuration file for streamlined development environment setup.

public/system/config/engine/registry.php

@@ -0,0 +1,47 @@
+<?php
+/**
+ * @package		OpenCart
+ * @author		Daniel Kerr
+ * @copyright	Copyright (c) 2005 - 2017, OpenCart, Ltd. (https://www.opencart.com/)
+ * @license		https://opensource.org/licenses/GPL-3.0
+ * @link		https://www.opencart.com
+*/
+
+/**
+* Registry class
+*/
+final class Registry {
+	private $data = array();
+
+	/**
+     * 
+     *
+     * @param	string	$key
+	 * 
+	 * @return	mixed
+     */
+	public function get($key) {
+		return (isset($this->data[$key]) ? $this->data[$key] : null);
+	}
+
+    /**
+     * 
+     *
+     * @param	string	$key
+	 * @param	string	$value
+     */	
+	public function set($key, $value) {
+		$this->data[$key] = $value;
+	}
+	
+    /**
+     * 
+     *
+     * @param	string	$key
+	 *
+	 * @return	bool
+     */
+	public function has($key) {
+		return isset($this->data[$key]);
+	}
+}