iOS: Add Swift Package Manager support and update project structure

azeekrequested to merge
develop into master
  • Added Swift Package Manager manifest for iOS integration
  • Moved Objective-C sources to new layout under ios/video_thumbnail/Sources/
  • Updated podspec to reflect new source file locations
  • Raised minimum iOS deployment target to 11.0 for SPM compatibility
  • Added README documentation for SPM integration
  • Updated CHANGELOG with new features

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

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