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)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>