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启动前主动探测端口是否可用,被占用时立即给出可操作的引导(换端口 / lsof 命令), 避免先初始化 DB/路由后才抛 EADDRINUSE 的延迟报错体验。 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>