Revamp onboarding and simplify setup flow

Merge the setup checklist into onboarding as step 5, remove the duplicate
OnboardingDownloadView in favor of ApplyChangesProgressView, fix locale-aware
userscript metadata parsing, remove unguarded print() and fatalError in
production, add semver tag trigger for Homebrew CI, and add v2.0.0 changelog.

Fix UI freeze when viewing userscripts during onboarding

Moved synchronous file I/O in syncFromDataManager() off the main thread
using Task.detached and a nonisolated helper function.

Fix onboarding to use split annoyances filters

Replace deprecated AdGuard Annoyances Filter with the 5 split filters:
- AdGuard Cookie Notices
- AdGuard Popups
- AdGuard Mobile App Banners
- AdGuard Other Annoyances
- AdGuard Widgets

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