Add InPost Pay integration to admin templates

- Created a new template for the cart rule form with custom label, switch, and choice widgets.
- Implemented the InPost Pay block in the order details template for displaying delivery method, APM, and VAT invoice request.
- Added legacy support for the order details template to maintain compatibility with older PrestaShop versions.

modules/inpostizi/upgrade/CacheClearer.php

@@ -0,0 +1,87 @@
+<?php
+
+declare(strict_types=1);
+
+namespace InPost\Izi\Upgrade;
+
+use Symfony\Component\Filesystem\Filesystem;
+
+final class CacheClearer
+{
+    /**
+     * @var Filesystem
+     */
+    private $filesystem;
+
+    private $registered = false;
+
+    private static $instance;
+
+    private function __construct()
+    {
+        $this->filesystem = new Filesystem();
+    }
+
+    public static function getInstance(): self
+    {
+        if (!isset(self::$instance)) {
+            self::$instance = new self();
+        }
+
+        return self::$instance;
+    }
+
+    public function clear(): void
+    {
+        if ($this->registered) {
+            return;
+        }
+
+        $this->registered = true;
+        $this->doClear();
+    }
+
+    private function doClear(): void
+    {
+        if (\Tools::version_compare(_PS_VERSION_, '1.7.1')) {
+            register_shutdown_function(function () {
+                $this->removeCacheDirectory('prod');
+                $this->removeCacheDirectory('dev');
+            });
+
+            return;
+        }
+
+        if (\Tools::version_compare(_PS_VERSION_, '8.0.0')) {
+            \Tools::clearSf2Cache('prod');
+            \Tools::clearSf2Cache('dev');
+
+            return;
+        }
+
+        if ('prod' !== _PS_ENV_) {
+            register_shutdown_function(function () {
+                $this->removeCacheDirectory('prod');
+            });
+        }
+
+        /* @see \Module::$_INSTANCE if not empty when dumping container metadata on PHP versions before 8.1, might cause the script to exceed memory limit
+         * in {@see \Symfony\Component\Config\Resource\ReflectionClassResource::generateSignature()} due to https://bugs.php.net/bug.php?id=80821 */
+        if (80100 > PHP_VERSION_ID) {
+            register_shutdown_function([\Module::class, 'resetStaticCache']);
+        }
+
+        \Tools::clearSf2Cache();
+    }
+
+    private function removeCacheDirectory(string $env): void
+    {
+        $dir = sprintf('%s/%s', dirname(_PS_CACHE_DIR_), $env);
+
+        $this->filesystem->remove($dir);
+    }
+
+    private function __clone()
+    {
+    }
+}