fix: Lazy import pycaw to avoid COM initialization conflict

Author: Desmond-Dong

src/core/models.py

@@ -19,13 +19,21 @@
 logger = logging.getLogger(__name__)
 
 
-# Windows volume control
-try:
-    from pycaw.pycaw import AudioUtilities
-    PYCAW_AVAILABLE = True
-except ImportError:
-    PYCAW_AVAILABLE = False
-    logger.warning("pycaw not available, duck/unduck will be disabled")
+# pycaw availability flag (lazy import to avoid COM conflicts)
+PYCAW_AVAILABLE = None  # Will be set on first use
+
+
+def _check_pycaw():
+    """Check pycaw availability (lazy import)"""
+    global PYCAW_AVAILABLE
+    if PYCAW_AVAILABLE is None:
+        try:
+            from pycaw.pycaw import AudioUtilities  # noqa: F401
+            PYCAW_AVAILABLE = True
+        except (ImportError, OSError):
+            PYCAW_AVAILABLE = False
+            logger.warning("pycaw not available, duck/unduck will be disabled")
+    return PYCAW_AVAILABLE
 
 
 class WakeWordType(str, Enum):
@@ -101,11 +109,12 @@ def __init__(self):
 
     def _init_volume_interface(self) -> None:
         """Initialize volume interface"""
-        if not PYCAW_AVAILABLE:
+        if not _check_pycaw():
             logger.warning("pycaw not available, volume control disabled")
             return
 
         try:
+            from pycaw.pycaw import AudioUtilities
             devices = AudioUtilities.GetSpeakers()
             # New pycaw uses EndpointVolume property
             self._volume_interface = devices.EndpointVolume

start.py

@@ -1,17 +1,16 @@
 """
-Home Assistant Windows 客户端启动脚本
-解决 Python 模块导入路径问题
+Home Assistant Windows Client Startup Script
 """
 
 import sys
 import os
 
-# 添加项目根目录到 Python 路径
+# Add project root to Python path
 project_root = os.path.dirname(os.path.abspath(__file__))
 if project_root not in sys.path:
     sys.path.insert(0, project_root)
 
-# 导入并运行主程序
+# Import and run main program
 if __name__ == "__main__":
     from src.main import main
     main()