Deepgram Flux から Cartesia Ink への移行

- wss://api.deepgram.com/v2/listen?model=flux-general-en&encoding=linear16&sample_rate=16000
+ wss://api.cartesia.ai/stt/turns/websocket?model=ink-2&encoding=pcm_s16le&sample_rate=16000

- Authorization: Token <DEEPGRAM_API_KEY>
+ X-API-Key: <CARTESIA_API_KEY>

- { "type": "CloseStream" }
+ { "type": "close" }

{
  "type": "TurnInfo",
  "event": "EndOfTurn",
  "turn_index": 0,
  "transcript": "Hi I need to cancel my subscription please.",
  "words": [...],
  "end_of_turn_confidence": 0.7,
  "audio_window_start": 0.0,
  "audio_window_end": 1.7
}

{
  "type": "turn.end",
  "transcript": "Hi I need to cancel my subscription please.",
  "request_id": "2ff8af53-4d38-479d-8287-58940f01c701"
}

  ws.onmessage = (message) => {
    const data = JSON.parse(message.data);
-   if (data.type !== "TurnInfo") return;
-   switch (data.event) {
-     case "StartOfTurn":    onTurnStart(); break;
-     case "Update":         onTranscriptUpdate(data.transcript); break;
-     case "EagerEndOfTurn": prepareReply(data.transcript); break;
-     case "TurnResumed":    cancelReply(); break;
-     case "EndOfTurn":      finalizeReply(data.transcript); break;
-   }
+   switch (data.type) {
+     case "turn.start":     onTurnStart(); break;
+     case "turn.update":    onTranscriptUpdate(data.transcript); break;
+     case "turn.eager_end": prepareReply(data.transcript); break;
+     case "turn.resume":    cancelReply(); break;
+     case "turn.end":       finalizeReply(data.transcript); break;
+   }
  };