Simplify ElevenLabs payload and set Rachel as default voice

backend/public/test_elevenlabs.php

@@ -57,16 +57,26 @@ echo "\n--- Generating Speech with ElevenLabs ---\n";
 $testText = "مرحباً بك! أنا مساعدك الذكي من نبيه، كيف يمكنني مساعدتك اليوم؟";
 echo "Text to generate: \"{$testText}\"\n";
 
+// Test general authentication by querying ElevenLabs models list
+echo "\n--- Testing ElevenLabs General Authentication (/v1/models) ---\n";
+$modelsUrl = 'https://api.elevenlabs.io/v1/models';
+$chModels = curl_init($modelsUrl);
+curl_setopt($chModels, CURLOPT_RETURNTRANSFER, true);
+curl_setopt($chModels, CURLOPT_HTTPHEADER, [
+    'xi-api-key: ' . $elApiKey
+]);
+$modelsResponse = curl_exec($chModels);
+$modelsHttpCode = curl_getinfo($chModels, CURLINFO_HTTP_CODE);
+curl_close($chModels);
+
+echo "Models API HTTP Status Code: {$modelsHttpCode}\n";
+echo "Models API Response: " . substr($modelsResponse, 0, 300) . "\n\n";
+
 // Execute ElevenLabs TTS directly in this test script to get detailed error logs
 $url = 'https://api.elevenlabs.io/v1/text-to-speech/' . $elVoiceId;
 
 $payload = json_encode([
-    'text' => $testText,
-    'model_id' => 'eleven_multilingual_v2',
-    'voice_settings' => [
-        'stability' => 0.5,
-        'similarity_boost' => 0.8
-    ]
+    'text' => $testText
 ]);
 
 echo "Sending API request to: {$url}...\n";