feat: Bilibili Live Danmaku -> Yukkuri TTS Reader

- Python main entry with CLI (--room-id, --voice, --speed)
- blivedm integration for real-time danmaku receiving
- Chinese-to-Japanese katakana conversion (pypinyin + mapping table)
- Node.js persistent bridge for aquestalk.js TTS synthesis
- Audio playback via sounddevice
- Message queue for sequential TTS playback

audio_player.py

@@ -0,0 +1,46 @@
+"""Audio playback for WAV files."""
+
+import asyncio
+import io
+import logging
+
+import sounddevice as sd
+import soundfile as sf
+
+logger = logging.getLogger(__name__)
+
+
+def play_wav(wav_data: bytes) -> None:
+    """Play WAV audio data synchronously (blocking).
+
+    Args:
+        wav_data: Raw WAV file bytes.
+    """
+    data, samplerate = sf.read(io.BytesIO(wav_data), dtype="float32")
+    sd.play(data, samplerate)
+    sd.wait()
+
+
+async def play_wav_async(wav_data: bytes) -> None:
+    """Play WAV audio data asynchronously.
+
+    Args:
+        wav_data: Raw WAV file bytes.
+    """
+    loop = asyncio.get_running_loop()
+    await loop.run_in_executor(None, play_wav, wav_data)
+
+
+def get_output_devices() -> list[dict]:
+    """List available audio output devices."""
+    devices = sd.query_devices()
+    result = []
+    for i, dev in enumerate(devices):
+        if dev["max_output_channels"] > 0:
+            result.append({
+                "index": i,
+                "name": dev["name"],
+                "channels": dev["max_output_channels"],
+                "default_samplerate": dev["default_samplerate"],
+            })
+    return result