Merge migrate-userdefaults-to-protobuf into main

This merge includes:
- Migration from UserDefaults/SwiftData to Protocol Buffers for all app data
- Fixed race conditions in auto-update concurrency management
- Reduced code duplication with helper methods
- Enhanced auto-update functionality with overdue checks and status caching

Add AdGuard URL Tracking Filter; remove 'Complete' mode

Introduces the AdGuard URL Tracking Filter to the filter list for enhanced privacy by removing tracking parameters from URLs. Removes the 'Complete' blocking level and related UI/logic from OnboardingView to simplify options and avoid site breakage risks.

Update README.md

Get rid of app updater

TestFlight/App Store will now serve this function

Update UserInterfaceState.xcuserstate