Implement full MVVM stack for two new community features: Clubs: - Persistent runner groups with type, privacy, and member management - Club discovery, creation, join/leave, and invite workflows - Member roles (Owner, Admin, Member) and capacity limits Challenges: - Time-bound competitive goals with progress tracking and leaderboards - Challenge types: distance, time, frequency, elevation, calories, streak - Progress submission, participation status, and ranking Files: - Models: Club.swift, Challenge.swift - Services: ClubService.swift, ChallengeService.swift - ViewModels: ClubViewModel.swift, ChallengeViewModel.swift - Views: ClubsView.swift, ClubDetailView.swift, ChallengesView.swift, ChallengeDetailView.swift - Tests: ClubServiceTests.swift, ChallengeServiceTests.swift - Updated README.md with new feature documentation
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