[本地语音降噪]：完成本地语音链路和噪音过滤，包含降噪模型、本地ASR和实时字幕稳定策略

src/owner_voice_pet/__init__.py

@@ -2,6 +2,7 @@
 
 from .config import AppConfig
 from .assistant_pipeline import TurnController, VoiceAssistantPipeline
+from .audio_preprocess import NoopAudioPreprocessor, SherpaOnnxDenoiserPreprocessor
 from .events import PipelineEvent, PipelineEventBus
 from .models import (
     AudioFrame,
@@ -33,6 +34,8 @@ __all__ = [
     "AppConfig",
     "TurnController",
     "VoiceAssistantPipeline",
+    "NoopAudioPreprocessor",
+    "SherpaOnnxDenoiserPreprocessor",
     "PipelineEvent",
     "PipelineEventBus",
     "AudioFrame",