Add App Store version comparison feature to My Profile view

[Copilot]

Implements app version comparison functionality that allows users to check for updates directly from the My Profile screen.

Changes Made

1. New AppVersionService

• Created AppVersionService.swift with iTunes Search API integration
• Implements semantic version comparison logic (handles major.minor.patch format)
• Provides App Store navigation capability
• Follows existing service patterns using Alamofire

2. VersionInfoView Component

• Added new "앱 정보" (App Info) section to MyProfileView
• Shows current app version (1.0.3) from bundle info
• Fetches latest version from App Store asynchronously
• Displays update button when newer version is available
• Shows update alert with release notes

3. UI Integration

• Positioned between notification settings and service terms
• Uses app's Pretendard font system for consistency
• Follows existing color scheme (gray01, blue02)
• Non-blocking version check with loading indicator

Technical Implementation

// Example usage in VersionInfoView
AppVersionService.shared.checkForAppUpdate { result in
    switch result {
    case .success(let versionResult):
        // Display current vs App Store version
        // Show update button if newer version available
    case .failure:
        // Graceful fallback - no disruption to user
    }
}

Testing

• Unit tests for version comparison logic
• Verified handling of edge cases (same version, older version, multi-digit versions)
• Tested semantic version parsing: 1.0.3 → 1.0.4, 1.1.0, 2.0.0

User Experience

• Automatic version check when My Profile loads
• Clear visual indication of update availability
• Direct navigation to App Store for updates
• Silent failure if API unavailable (no user disruption)

Fixes #131.

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