fix(ios): system-surface disclosure parity across selector routes

[thymikee]

Follow-up to #2438 / #2448.

Purpose. The system-surface disclosure currently rides the snapshot warnings. Ensure it also surfaces on selector-backed routes (find/wait/get/is), matching the Android systemSurfaceDisclosure pattern, so the disclosure cannot silently drop on one route while surviving on another.

Required behavior. Route the disclosure through the shared selector response builder keyed off the capture's system-surface provenance (generalize withSystemSurfaceDisclosure), rather than only the direct snapshot warning path.

Observable completion. get/is/find/wait against a served sheet include the disclosure; a test asserts parity across routes.

Dependencies. #2448 (provenance + snapshot disclosure landed).

[thymikee]

Folded into #2448 following review there. The disclosure previously rode only the direct snapshot warnings, and selector routes read only the Android systemSurfaceOnly field.

withSystemSurfaceDisclosure now also emits the iOS disclosure from iosSystemSurfaceBundleId, so find/wait/get/is disclose an in-place web sign-in sheet on the same shared seam as the Android surface.

Closing once #2448 merges.