Implements a flexible email service that integrates with Resend API and supports development mode for easier testing. Features: - Resend API integration for production email delivery - Development mode that logs emails instead of sending - Magic link URL logging in dev mode for testing - Helper methods for magic link and registration emails - Comprehensive test coverage (100% for service) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>