修复个人微信前端在 headless 容器内无法登录#595
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容器化部署时个人微信前端无法首次扫码登录，定位并修复 4 处问题： 1. isatty 闸门顺序错误：__main__ 先把 stdout 重定向到日志文件，再判 sys.stdout.isatty()——文件句柄恒为 false，导致无 token 时必然退出。 改为始终走 QR 登录、二维码打到真实 stdout（docker logs 可见）， 无需 TTY 即可扫码。 2. get_bot_qrcode 无容错：被限流时响应缺 'qrcode' 字段直接 KeyError 崩溃， 配合 restart 策略形成死亡螺旋。改为退避重试，等 qrcode + img_content 都就绪。 3. get_qrcode_status 轮询只 catch ReadTimeout：限流返回非 JSON 时 .json() 抛错崩溃。改为捕获所有 RequestException + ValueError 容错重试。 4. PNG 兜底依赖 PIL，缺失时 qrcode.make().save() 抛 ModuleNotFoundError， 且 traceback 被 finally 重定向到日志文件而难以发现。改为先打 ASCII 二维码（扫码真正所需，无依赖），PNG 保存包 try 失败不崩。 均为通用的容器化健壮性改进。 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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