Add curl example showing model parameter usage

public/text-to-speech.html

@@ -117,12 +117,22 @@
 
         <p>Test our community-hosted endpoint before self-hosting:</p>
 
-        <pre><code class="bash">curl https://speech.ai.unturf.com/v1/audio/speech \
+        <pre><code class="bash"># Auto-detect model from voice name
+curl https://speech.ai.unturf.com/v1/audio/speech \
   -H "Content-Type: application/json" \
   -d '{
     "input": "Welcome to uncloseai-speech. Four TTS engines, zero API keys.",
     "voice": "alloy"
-  }' > output.mp3</code></pre>
+  }' > output.mp3
+
+# Explicitly specify model (tts-1, tts-1-hd, tts-1-silero, tts-1-kokoro)
+curl https://speech.ai.unturf.com/v1/audio/speech \
+  -H "Content-Type: application/json" \
+  -d '{
+    "model": "tts-1-hd",
+    "input": "High quality XTTS voice cloning.",
+    "voice": "alloy"
+  }' > output-hd.mp3</code></pre>
 
         <h3 id="voice-auto-detection">Auto-Detection Magic</h3>