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/lexer/smarty_internal_templatelexer.plex

@@ -161,7 +161,6 @@ class Smarty_Internal_Templatelexer
                                                'COMMENT'     => 'comment',
                                                'AS'          => 'as',
                                                'TO'          => 'to',
-                                               'PHP'         => '"<?php", "<%", "{php}" tag',
                                                'LOGOP'       => '"<", "==" ... logical operator',
                                                'TLOGOP'      => '"lt", "eq" ... logical operator; "is div by" ... if condition',
                                                'SCOND'       => '"is even" ... if condition',

libs/smarty/lexer/smarty_internal_templateparser.y

@@ -785,6 +785,9 @@ value(res)       ::= ns1(c)DOUBLECOLON static_class_access(s). {
         if (isset($this->smarty->registered_classes[c])) {
             res = $this->smarty->registered_classes[c].'::'.s[0].s[1];
         } else {
+            trigger_error('Using unregistered static method "' . c.'::'.s[0] . '" in a template is deprecated and will be ' .
+                    'removed in a future release. Use Smarty::registerClass to explicitly register ' .
+                    'a class for access.', E_USER_DEPRECATED);
             res = c.'::'.s[0].s[1];
         } 
     } else {