Dev-Umgebung: Kompatibilität für PHP 8.3 + Smarty 4.5.6

- Smarty 4.1.1 → 4.5.6 (behebt dynamic property deprecations)
- Core-Klassen: #[\AllowDynamicProperties] für Admin_role, base, Config,
  Customer, Customer_group, CustomerGroups, Item, Structure, website
- website.class.php: counts[parent_id] initialisieren vor ++ (PHP 8.1)
- layout.class.php: HTTP_ACCEPT_LANGUAGE mit isset-Guard
- website_init.php: session_status()-Check vor session_start
- .htaccess: HTTPS-Redirect via X-Forwarded-Proto (statt SERVER_PORT)
- themes/easyshop_advanced/media/: Parent-Theme-Assets nachgezogen
- .gitignore: smarty.4.1.1.bak ausschließen

libs/smarty/docs/programmers/api-functions/api-register-object.md

@@ -0,0 +1,44 @@
+registerObject()
+
+register an object for use in the templates
+
+Description
+===========
+
+void
+
+registerObject
+
+string
+
+object\_name
+
+object
+
+object
+
+array
+
+allowed\_methods\_properties
+
+boolean
+
+format
+
+array
+
+block\_methods
+
+> **Note**
+>
+> When you register/assign objects to templates, be sure that all
+> properties and methods accessed from the template are for presentation
+> purposes only. It is very easy to inject application logic through
+> objects, and this leads to poor designs that are difficult to manage.
+> See the Best Practices section of the Smarty website.
+
+See the [objects section](#advanced.features.objects) for more
+information.
+
+See also [`getRegisteredObject()`](#api.get.registered.object), and
+[`unregisterObject()`](#api.unregister.object).