feat: Add Swift Package Manager support and restructure iOS implementation

azeekrequested to merge
t3 into main
  • Add Swift Package Manager support for iOS implementation
  • Move iOS sources into new ios/uri_to_file layout and update podspec
  • Align iOS method channel name with Dart API
  • Fix Swift Package Manager builds by removing Objective-C bridge layer
  • Update version to 1.2.0
  • Update README with Swift Package Manager installation instructions

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Co-Authored-By: Claude noreply@anthropic.com

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