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/designers/language-basic-syntax/language-syntax-comments.md

@@ -0,0 +1,69 @@
+# Comments
+
+Template comments are surrounded by asterisks, and that is surrounded by
+the [delimiter](../../programmers/api-variables/variable-left-delimiter.md) tags like so:
+
+## Examples
+
+```smarty
+{* this is a comment *}
+```
+
+Smarty comments are NOT displayed in the final output of the template,
+unlike `<!-- HTML comments -->`. These are useful for making internal
+notes in the templates which no one will see ;-)
+
+```smarty
+{* I am a Smarty comment, I don't exist in the compiled output  *}
+<html>
+    <head>
+     <title>{$title}</title>
+    </head>
+<body>
+
+    {* another single line smarty comment  *}
+    <!-- HTML comment that is sent to the browser -->
+
+    {* this multiline smarty
+       comment is
+       not sent to browser
+    *}
+
+    {*********************************************************
+    Multi line comment block with credits block
+      @ author:         bg@example.com
+      @ maintainer:     support@example.com
+      @ para:           var that sets block style
+      @ css:            the style output
+    **********************************************************}
+
+    {* The header file with the main logo and stuff  *}
+    {include file='header.tpl'}
+
+
+    {* Dev note:  the $includeFile var is assigned in foo.php script  *}
+    <!-- Displays main content block -->
+    {include file=$includeFile}
+
+    {* this <select> block is redundant *}
+    {*
+    <select name="company">
+      {html_options options=$vals selected=$selected_id}
+    </select>
+    *}
+
+    <!-- Show header from affiliate is disabled -->
+    {* $affiliate|upper *}
+
+    {* you cannot nest comments *}
+    {*
+    <select name="company">
+      {* <option value="0">-- none -- </option> *}
+      {html_options options=$vals selected=$selected_id}
+    </select>
+    *}
+
+    </body>
+</html>
+```
+