Gemini 2.5 Pro Preview TTS

curl https://router.tangle.tools/v1/chat/completions \
  -H "Authorization: Bearer $TANGLE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "google/gemini-2.5-pro-preview-tts",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'