- Add AppleSocialAuth model to store Apple ID linkages
- Create AppleAuthService for JWT verification with Apple's public keys
- Add AppleSignIn handler and route (POST /auth/apple-sign-in/)
- Implement account linking (links Apple ID to existing accounts by email)
- Add Redis caching for Apple public keys (24-hour TTL)
- Support private relay emails (@privaterelay.appleid.com)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
409d9716bd