[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/runtime.py

@@ -4,6 +4,7 @@ import sys
 from dataclasses import dataclass, field
 from typing import Protocol
 
+from .audio_preprocess import NoopAudioPreprocessor, SherpaOnnxDenoiserPreprocessor
 from .config import AppConfig
 from .assistant_pipeline import VoiceAssistantPipeline
 from .conversation import ConversationContext
@@ -369,6 +370,11 @@ def build_live_runtime(config: AppConfig, reporter: RuntimeReporter | None = Non
                 "min_rms": config.speaker_min_rms,
             }
         )
+    audio_preprocessor = (
+        SherpaOnnxDenoiserPreprocessor(config.speech_models_dir)
+        if config.noise_filter_enabled
+        else NoopAudioPreprocessor()
+    )
     return VoiceAssistantPipeline(
         config=config,
         transport=SoundDeviceAudioTransport(output_device=config.audio_output_device),
@@ -380,6 +386,7 @@ def build_live_runtime(config: AppConfig, reporter: RuntimeReporter | None = Non
             score=config.wake_kws_score,
         ),
         vad_recorder=recorder_cls(**recorder_kwargs),
+        audio_preprocessor=audio_preprocessor,
         stt=stt,
         realtime_stt=realtime_stt,
         llm=OpenAICompatibleLlmProvider(config),