Add Xcode archive project

[offyotto]

What changed

• Added a real Locale.xcodeproj with app, DNS proxy system extension, and shared Swift library targets.
• Set automatic signing for the app and DNS proxy targets with team 6VDP675K4L.
• Added checked-in Info.plists for the app and system extension.
• Forced the embedded DNS proxy wrapper name to dev.offyotto.Locale.LocaleDNSProxy.systemextension, matching its CFBundleIdentifier as App Store Connect requires.
• Declared ITSAppUsesNonExemptEncryption = false in the app and DNS proxy Info.plists so App Store Connect can skip repeated encryption documentation prompts.
• Documented that App Store archives must use Locale.xcodeproj / LocaleApp, not the Swift package workspace.

Why

Archiving the SwiftPM package workspace produces a Generic Xcode Archive. The new app target archives to Products/Applications/Locale.app, embeds LocaleDNSProxy.systemextension, and preserves the team/signing metadata Xcode Organizer needs.

App Store Connect also rejects system extensions whose bundle folder name does not equal CFBundleIdentifier + .systemextension. The archive now embeds the extension at:

Locale.app/Contents/Library/SystemExtensions/dev.offyotto.Locale.LocaleDNSProxy.systemextension

while keeping the executable/module as LocaleDNSProxy.

Locale does not implement proprietary or standard encryption algorithms, so the upload bundle now declares non-exempt encryption usage as false.

Validation

• swift test
• plutil -lint Resources/Locale-Info.plist Resources/LocaleDNSProxy-Info.plist
• xcodebuild -project Locale.xcodeproj -scheme LocaleApp -configuration Debug -destination 'platform=macOS' CODE_SIGNING_ALLOWED=NO build
• xcodebuild -project Locale.xcodeproj -scheme LocaleApp -configuration Debug -destination 'platform=macOS' -allowProvisioningUpdates build
• xcodebuild -project Locale.xcodeproj -scheme LocaleApp -configuration Release -destination 'generic/platform=macOS' -archivePath /tmp/LocaleEncryptionArchive.xcarchive -allowProvisioningUpdates archive
• Verified archive metadata: ApplicationPath = Applications/Locale.app, Team = 6VDP675K4L
• Verified embedded system extension path equals dev.offyotto.Locale.LocaleDNSProxy.systemextension
• Verified system extension CFBundleIdentifier = dev.offyotto.Locale.LocaleDNSProxy
• Verified archived app and DNS proxy both contain ITSAppUsesNonExemptEncryption = false
• Verified app and DNS proxy signatures/entitlements with codesign -dvvv --entitlements :-