Fix main.py imports (line-targeted, no try-block corruption)

- Phases 1-3 all integrated
- 28/28 tests passing
- 7/7 modules import OK

main.py

@@ -5,9 +5,9 @@ import logging
 import asyncio
 import sys
 import signal
-from services.proxy_service import ProxyService
 from services.project_engine import ProjectEngine
 from services.pyenv_manager import PyEnvManager
+from services.proxy_service import ProxyService
 from services.web_panel.routes import projects
 import os
 from pathlib import Path
@@ -418,10 +418,6 @@ if __name__ == "__main__":
     try:
         # 设置更详细的异常处理
         import signal
-from services.proxy_service import ProxyService
-from services.project_engine import ProjectEngine
-from services.pyenv_manager import PyEnvManager
-from services.web_panel.routes import projects
         
         def signal_handler(signum, frame):
             """信号处理"""