feat(ocmod): add TeleCart admin sidebar menu and local dev setup (#57)

- Add telecart.ocmod.xml: inject TeleCart menu item (with Settings child) after Marketing
- Add scripts/apply_ocmod.sh to symlink ocmod file in Docker container
- Add make ocmod target
- In CI: set version in telecart.ocmod.xml from version_meta; use docs.telecart.pro link

Co-authored-by: Cursor <cursoragent@cursor.com>

module/oc_telegram_shop/install.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<modification>
+	<name>TeleCart</name>
+	<code>telecart</code>
+	<version>1.0</version>
+	<author>TeleCart</author>
+	<link>https://docs.telecart.pro/</link>
+	<file path="admin/controller/common/column_left.php">
+		<operation>
+			<search><![CDATA[// System]]></search>
+			<add position="before"><![CDATA[			// BEGIN TeleCart modification
+			$telecart = array();
+			$telecart[] = array(
+				'name'	   => 'Настройки',
+				'href'     => $this->url->link('extension/module/tgshop', 'user_token=' . $this->session->data['user_token'], true),
+				'children' => array()
+			);
+			$data['menus'][] = array(
+				'id'       => 'menu-telecart',
+				'icon'     => 'fa-telegram',
+				'name'     => 'TeleCart',
+				'href'     => '',
+				'children' => $telecart
+			);
+			// END TeleCart modification
+
+			]]></add>
+		</operation>
+	</file>
+</modification>