fix: venv改为懒加载，兼容嵌入式CPython无venv模块

main.py

@@ -4,9 +4,16 @@
 import logging
 import asyncio
 import sys
+import os as _os
 import signal
 import time
 import argparse
+
+# 确保项目根目录在 sys.path 中 (嵌入式 CPython / PyPy 需要)
+_sys_path_root = _os.path.dirname(_os.path.abspath(__file__))
+if _sys_path_root not in sys.path:
+    sys.path.insert(0, _sys_path_root)
+
 from services.project_engine import ProjectEngine
 from services.pyenv_manager import PyEnvManager
 from services.proxy_service import ProxyService