docs(ios): update test app docs with recent implementation details
Updated iOS test app documentation to reflect recent implementation work:
channel methods, permission methods, BGTaskScheduler simulator limitation,
and plugin discovery troubleshooting.
Changes:
- Added channel methods (isChannelEnabled, openChannelSettings) to UI mapping
- Fixed permission method name (requestPermissions → requestNotificationPermissions)
- Added checkPermissionStatus to UI mapping
- Added Channel Management section explaining iOS limitations
- Added BGTaskScheduler simulator limitation documentation (Code=1 is expected)
- Added plugin discovery troubleshooting section (CAPBridgedPlugin conformance)
- Added permission and channel methods to behavior classification table
- Updated Known OS Limitations with simulator-specific BGTaskScheduler behavior
Files modified:
- doc/test-app-ios/IOS_TEST_APP_REQUIREMENTS.md: UI mapping, debugging scenarios
- doc/test-app-ios/IOS_PREFETCH_TESTING.md: Known limitations, behavior classification
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