iOS frameInfo x.request A/B fixtures

Controlled canary origin: https://ios-frameinfo-xrequest-ab.pages.dev

• Qishui Music - AFFECTED (existing iOS 20.3.0 verification)
• Toutiao - AFFECTED (iOS 17.8.0, reproduced twice)
• Jianying - NOT_VERIFIED (iOS 20.9.0)
• Fanqie Novel - AFFECTED primitive (iOS 7.3.2; external one-tap reachability not established)
• Dreamina - NOT_VERIFIED (iOS 2.3.1; tested container has no V3 handler)