The WeChat Channels login page now embeds the QR code in an
open.weixin.qq.com/connect/qrconnect iframe whose img.qrcode src is a
relative path (e.g. /connect/qrcode/xxxx) instead of an inline
data:image/ URL. The previous logic looked for a login-for-iframe
frame and only accepted data:image/ sources, so login always failed
with '未获取到视频号登录二维码地址'.
Changes:
- Detect the qrconnect iframe and resolve the relative img src,
download the QR image via the browser context and convert it to a
data URL so downstream save/decode logic stays unchanged
- Keep the legacy login-for-iframe and selector fallbacks
- Tolerate QR extraction failure: the login flow now continues and
lets the user scan directly in the headed browser instead of
aborting the whole login
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