Fix Joomla 3.x compatibility for captcha.eu plugin - adds fallback for getWebAssetManager()

joomla3-fix.patch

diff --git a/captcha_eu.php b/captcha_eu.php
index e73a26a..72e549d 100644
--- a/captcha_eu.php
+++ b/captcha_eu.php
@@ -88,10 +88,16 @@ class PlgCaptchacaptcha_eu extends CMSPlugin
 
         $sdkSrc = 'https://www.captcha.eu/sdk.js';
 
-        // Load assets, the callback should be first
-        $this->app->getDocument()->getWebAssetManager()
-            ->registerAndUseScript('plg_captcha_eu_sdk_src', $sdkSrc, [], ['defer' => true]);
-            
+        // Load assets - use WebAssetManager for Joomla 4+, fallback to addScript for Joomla 3.x
+        $document = $this->app->getDocument();
+        if (method_exists($document, 'getWebAssetManager')) {
+            // Joomla 4.x+
+            $document->getWebAssetManager()
+                ->registerAndUseScript('plg_captcha_eu_sdk_src', $sdkSrc, [], ['defer' => true]);
+        } else {
+            // Joomla 3.x
+            $document->addScript($sdkSrc, ['version' => 'auto'], ['defer' => true]);
+        }
 
         return true;
     }