Migrate from ElevenLabs to Railwail

Before (ElevenLabs):

import { ElevenLabsClient } from "elevenlabs";

const el = new ElevenLabsClient({ apiKey: process.env.ELEVENLABS_API_KEY });

const audio = await el.generate({
  voice: "Rachel",
  text: "Hello world",
  model_id: "eleven_multilingual_v3",
});
// audio is a Readable stream

After (Railwail):

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.RAILWAIL_API_KEY,
  baseURL: "https://railwail.com/api/v1",
});

const res = await client.audio.speech.create({
  model: "openai-tts-1",
  voice: "alloy",
  input: "Hello world",
  response_format: "mp3",
});
const buffer = Buffer.from(await res.arrayBuffer());
require("fs").writeFileSync("out.mp3", buffer);

from openai import OpenAI

client = OpenAI(
    api_key=os.environ["RAILWAIL_API_KEY"],
    base_url="https://railwail.com/api/v1",
)

with client.audio.speech.with_streaming_response.create(
    model="openai-tts-1",
    voice="alloy",
    input="Hello world",
    response_format="mp3",
) as resp:
    resp.stream_to_file("out.mp3")

curl https://railwail.com/api/v1/audio/speech \
  -H "Authorization: Bearer $RAILWAIL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai-tts-1",
    "voice": "alloy",
    "input": "Hello world",
    "response_format": "mp3"
  }' \
  -o out.mp3