Add universal binary support and upgrade to Sparkle 2.x

[xgitqa]

Summary

This PR modernizes the Dozer build system to support universal binaries (arm64 + x86_64) on Apple Silicon Macs and upgrades to Sparkle 2.x for improved update handling.

Key Changes

• Universal Binary Support: Added architecture configuration to build universal binaries for both arm64 and x86_64, with CI verification
• Sparkle 2.x Upgrade: Migrated from Sparkle 1.26 to 2.6.4, updating the updater initialization and API usage
  • Replaced SUUpdater.shared() with SPUStandardUpdaterController in AppDelegate
  • Updated GeneralVC and DozerVC to use the new Sparkle 2.x API
  • Modified code signing script to handle new Sparkle 2.x directory structure (XPCServices, Updater.app)
• Build System Improvements:
  • Updated Xcode version requirement from 10.2.1 to 15.0
  • Added GitHub Actions CI workflow for automated builds on macOS 14
  • Enhanced SwiftGen path detection to support both Homebrew ARM and Intel installations
  • Updated Carthage bootstrap to use xcframeworks for better Apple Silicon support
• Dependency Updates: Pinned Carthage dependencies to specific versions for reproducible builds
• Code Quality: Improved code formatting and removed duplicate configuration entries

Implementation Details

• The SPUStandardUpdaterController is retained as a property in AppDelegate to maintain the required lifetime for Sparkle 2.x
• The CI workflow builds and verifies universal binaries, confirming both architecture slices are present
• SwiftGen path detection now checks /opt/homebrew/bin first (Apple Silicon native) before falling back to /usr/local/bin

https://claude.ai/code/session_01Q2P1R8MUG4huWY8QzH5o9m