[依赖、模型和配置]：完成本地语音模型准备，包含.env配置、模型下载脚本和model-check

src/owner_voice_pet/config.py

@@ -20,6 +20,7 @@ class AppConfig:
     audio_output_device: str | None = None
     asset_dir: Path = Path("assets/pet")
     log_dir: Path = Path("logs")
+    speech_models_dir: Path = Path("models")
     context_max_messages: int = 12
     context_max_chars: int = 12000
 
@@ -44,6 +45,7 @@ class AppConfig:
             audio_output_device=get("AUDIO_OUTPUT_DEVICE"),
             asset_dir=Path(get("ASSET_DIR", "assets/pet") or "assets/pet"),
             log_dir=Path(get("LOG_DIR", "logs") or "logs"),
+            speech_models_dir=Path(get("SPEECH_MODELS_DIR", "models") or "models"),
             context_max_messages=int(get("CONTEXT_MAX_MESSAGES", "12") or "12"),
             context_max_chars=int(get("CONTEXT_MAX_CHARS", "12000") or "12000"),
         )