* fix(browser): route localhost through proxy when PUPPETEER_PROXY is set
Chrome bypasses proxies for localhost/loopback by default (since v72).
Add --proxy-bypass-list=<-loopback> so localhost traffic reaches mitmdump,
enabling proxy_traffic.log to capture auth flows for local targets.
Made-with: Cursor
* fix(browser): make proxy loopback bypass opt-in via PUPPETEER_PROXY_BYPASS_LOOPBACK
Made-with: Cursor