Fixed iOS 13.0 compatibility issue in test harness by replacing Logger
(iOS 14+) with os_log (iOS 13+). Fixed build script to correctly detect
and sync Capacitor config from App subdirectory. Unified both Android
and iOS test app UIs to use www/index.html as the canonical source.
Changes:
- DailyNotificationBackgroundTaskTestHarness: Replace Logger with os_log
for iOS 13.0 deployment target compatibility
- build-ios-test-app.sh: Fix Capacitor sync path detection to check
both current directory and App/ subdirectory for config files
- test-apps: Update both Android and iOS test apps to use www/index.html
as the canonical UI source for consistency
This ensures the plugin builds on iOS 13.0+ and both test apps provide
the same testing experience across platforms.