Update `paths.py`: improve PROJECT_ROOT resolution with `_MEIPASS` support and enhance third-party path handling.

src/voice_dialogue/config/paths.py

@@ -3,7 +3,8 @@ from pathlib import Path
 
 # 项目根目录
 HERE = Path(__file__).parent
-PROJECT_ROOT = HERE.parent.parent.parent
+_project_root = getattr(sys, '_MEIPASS', HERE.parent.parent.parent.as_posix())
+PROJECT_ROOT = Path(_project_root)
 
 # 资源路径 - 统一到assets目录
 ASSETS_PATH = PROJECT_ROOT / "assets"
@@ -27,5 +28,5 @@ FRONTEND_ASSETS_PATH = ASSETS_PATH / "www"
 
 def load_third_party():
     # 添加第三方库到 Python 路径
-    if str(THIRD_PARTY_PATH) not in sys.path:
+    if THIRD_PARTY_PATH.exists() and str(THIRD_PARTY_PATH) not in sys.path:
         sys.path.insert(0, str(THIRD_PARTY_PATH))