[Bugfix] Accept 'speaker' as alias for 'voice' in TTS speech API (#2424)

Signed-off-by: marksverdhei <marksverdhei@hotmail.com>
Signed-off-by: marksverdhai <249650165+marksverdhai@users.noreply.github.com>
Co-authored-by: marksverdhai <249650165+marksverdhai@users.noreply.github.com>

examples/online_serving/qwen3_tts/openai_speech_client.py

@@ -71,7 +71,7 @@ def run_tts_generation(args) -> None:
     payload = {
         "model": args.model,
         "input": args.text,
-        "speaker": args.speaker,
+        "voice": args.speaker,
         "response_format": args.response_format,
     }