fix(ios-qa): allow physical iPad devices in tunnel bootstrap (#2743)

[loulanyue]

Summary of Changes

gstack ios-qa rejected connected physical iPad devices during tunnel bootstrap because isIPhoneDevice strictly matched only iPhones. The app debug StateServer is directly reachable over the CoreDevice IPv6 tunnel on iPads.

Fix

1. Expand device filter: Updated isSupportedIOSDevice in tunnel-bootstrap.ts to accept both iphone and ipad device types/models under iOS / iPadOS platforms.
2. Clarified error diagnostics: Updated diagnostics to accurately reference iPhone and iPad devices.
3. Unit tests: Added unit tests in test/tunnel-bootstrap.test.ts verifying physical iPad acceptance and distinct rejection of non-iOS devices. All 26 tests pass.

Fixes #2743

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