fix: L1 privacy manifest, L2 privacy policy, M3-M5 code quality, version/icon confirmed

L1: Add PrivacyInfo.xcprivacy declaring UserDefaults (CA92.1), FileTimestamp (C617.1),
    DiskSpace (E174.1); register in Xcode project Copy Bundle Resources phase.

L2: Add PRIVACY.md - self-hosted server model, no third-party data collection.

L6: Version 1.0.0+1 already set in pubspec.yaml (confirmed).

L7: App icon sizes verified - all required sizes present, no alpha channel.

M3: Extract NavigateNotifier to lib/services/navigate_notifier.dart; replace
    mutable static instance with navigateNotifierProvider (Riverpod StateProvider).

M4: Replace O(n log n) Set eviction in _seenSeqs with O(1) FIFO List+Set pair.

M5: Register com.mnsoft.pailot/backup MethodChannel in SceneDelegate; call
    NSURLIsExcludedFromBackupKey on messages directory at first init.

	PRIVACY.md	diff | view | blame | history
	TODO-appstore.md	diff | view | blame | history
	ios/Runner.xcodeproj/project.pbxproj	diff | view | blame | history
	ios/Runner/AppDelegate.swift	diff | view | blame | history
	ios/Runner/PrivacyInfo.xcprivacy	diff | view | blame | history
	ios/Runner/SceneDelegate.swift	diff | view | blame | history
	lib/providers/providers.dart	diff | view | blame | history
	lib/screens/chat_screen.dart	diff | view | blame | history
	lib/screens/navigate_screen.dart	diff | view | blame | history
	lib/services/message_store.dart	diff | view | blame | history
	lib/services/navigate_notifier.dart	diff | view | blame | history