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fix(captcha): 补齐 puppeteer-core lock 并修复 Chromium 进程泄漏（关联 #1） - #12
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- captcha_node/package-lock.json 补 puppeteer-core：2.6.3 加依赖时未更新 lock， npm ci 直接失败，真浏览器求解器起不来 - solver_pw.js：记录 Chromium PID，exit 钩子 + 硬超时（早于调用方 20s）自我清场， 防止被 SIGKILL 时留下已 setsid 逃逸、killpg 打不到的 Chromium - captcha.py：按 PPID==1 + cmdline 特征清扫孤儿 Chromium 兜底（单实例约 360MB） 关联 issue dengyie#1：验证码 500/4028 的部分成因即求解器无法启动与进程堆积； Windows 用户另需把 ZCODE_CHROMIUM_PATH 指到本机 Chromium（上游已有该配置项）。
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问题
npm ci失败，真浏览器求解器起不来：2.6.3 给captcha_node/package.json加了puppeteer-core依赖，但package-lock.json没有同步更新。任何按 lock 安装的部署（Docker、CI、npm ci）都会直接报错，验证码求解必然失败，表现为验证码求解失败: 多次重试无结果 (HTTP 500) (4028)（issue 无法完成人机校验: 验证码求解失败: 多次重试无结果 (HTTP Status: 500) (4028) #1）。setsid脱离 node 的进程组（PGID=SESS=自身）。node 正常退出时还能由 exit 钩子清理，但求解超时被SIGKILL或同步卡死时，killpg(node 组)打不到它，每个残留实例约 360MB，长时间运行会把小内存机器拖死。修法
captcha_node/package-lock.json：补齐puppeteer-core及其依赖树。captcha_node/solver_pw.js：process.on("exit")同步补杀（覆盖正常退出、exit(code)、未捕获异常）；exit(2)，避免挂死迫使调用方SIGKILL留下逃逸进程。app/captcha.py：按PPID==1+ cmdline 含 chromium 特征清扫孤儿进程兜底（并发求解中活跃 Chromium 的父进程是活着的 node，PPID≠1，不会误杀；非 Linux 无/proc时直接跳过）。验证
ps可见多个 PPID=1 的 Chromium 常驻；修复后连续多轮求解不再堆积。附注
Windows 用户遇到
4028还需把ZCODE_CHROMIUM_PATH指到本机 Chromium 可执行文件（该配置项上游已支持，默认值/usr/local/bin/chromium只适用于容器）。issue #1 评论里提到的「改一下 Chromium 路径」即此。