Add local MeloTTS support

docker/melotts/Dockerfile

@@ -0,0 +1,18 @@
+FROM python:3.9-slim
+
+ENV PYTHONUNBUFFERED=1
+
+WORKDIR /opt/realtime-voice-bot
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  build-essential \
+  git \
+  libsndfile1 \
+  && rm -rf /var/lib/apt/lists/*
+
+RUN pip install --no-cache-dir git+https://github.com/myshell-ai/MeloTTS.git@v0.1.2
+RUN python -m unidic download
+
+COPY melo_tts_cli.py /opt/realtime-voice-bot/melo_tts_cli.py
+
+ENTRYPOINT ["python", "/opt/realtime-voice-bot/melo_tts_cli.py"]

docker/melotts/melo_tts_cli.py

@@ -0,0 +1,36 @@
+import argparse
+from pathlib import Path
+
+from melo.api import TTS
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--text", required=True)
+    parser.add_argument("--output", required=True)
+    parser.add_argument("--language", default="KR")
+    parser.add_argument("--speaker", default="KR")
+    parser.add_argument("--speed", type=float, default=1.0)
+    parser.add_argument("--device", default="cpu")
+    args = parser.parse_args()
+
+    output_path = Path(args.output)
+    output_path.parent.mkdir(parents=True, exist_ok=True)
+
+    model = TTS(language=args.language, device=args.device)
+    speaker_ids = model.hps.data.spk2id
+
+    if args.speaker not in speaker_ids:
+        supported = ", ".join(sorted(speaker_ids.keys()))
+        raise SystemExit(f"지원하지 않는 speaker 입니다: {args.speaker}. 사용 가능: {supported}")
+
+    model.tts_to_file(
+        args.text,
+        speaker_ids[args.speaker],
+        str(output_path),
+        speed=args.speed,
+    )
+
+
+if __name__ == "__main__":
+    main()