Normalize AI provider validation

administrator/components/com_testquestions/src/Service/AiService.php

@@ -11,14 +11,19 @@ class AiService
     public function evaluate(string $provider, string $apiKey, string $question, string $answer, string $pattern): string
     {
         $provider = strtolower(trim($provider));
+        $provider = preg_replace('/[^a-z]/', '', $provider);
         $config = $provider === 'grok'
             ? ['url' => 'https://api.x.ai/v1/responses', 'model' => 'grok-4.7']
             : ['url' => 'https://api.openai.com/v1/responses', 'model' => 'gpt-4.1-mini'];
 
-        if (!in_array($provider, ['openai', 'grok'], true) || trim($apiKey) === '') {
+        if (trim($apiKey) === '') {
             throw new \RuntimeException('AI_NOT_CONFIGURED');
         }
 
+        if (!in_array($provider, ['openai', 'grok'], true)) {
+            throw new \RuntimeException('Nieprawidłowy dostawca AI: ' . $provider);
+        }
+
         $input = "Oceń odpowiedź ucznia na pytanie otwarte.\n\n"
             . "Pytanie:\n" . $question . "\n\n"
             . "Wzorzec odpowiedzi:\n" . $pattern . "\n\n"