fix: clear mixed-port conflict UX (EADDRINUSE)#21
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Map Windows/POSIX EADDRINUSE-style listen errors to a bilingual Chinese+English message in the core startup path (log + reject), guiding users to free the port or switch mixed-port to 17890+.
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Summary
When sing-box fails to bind mixed-port with Windows
Only one usage of each socket address/ POSIXaddress already in use/EADDRINUSE, the core startup path now logs and rejects with a clear bilingual (zh-CN + en) user-facing message.The message tells the user the port is occupied (often another proxy such as Bettbox on 7890) and to change mixed-port in Settings to 17890+.
Changes
src/main/core/listenError.ts(isPortInUseListenError/mapCoreListenError/formatPortConflictUserMessage)manager.tsstartup listeners (stderr/stdout listen errors, process error, and fatal-line mapping on early exit)Safety
No AikoBox launch, no sing-box run, no Bettbox/process kill, no system proxy changes.