## Summary
- Add `SyncUserToResendListener` to automatically sync users to Resend
contacts on registration
- Add `ResendService` for Resend API interactions
- Add `resend:sync` command to bulk sync existing users
## Changes
- **New**: `app/Listeners/SyncUserToResendListener.php` -
Auto-discovered queued listener
- **New**: `app/Services/ResendService.php` - Service for Resend
contacts API
- **New**: `app/Console/Commands/ResendSyncCommand.php` - Bulk sync
command
- **New**: Tests for listener and command
## Usage
New users are automatically synced on registration. For existing users:
```bash
php artisan resend:sync
```
## Test plan
- [x] New user registration triggers contact sync
- [x] `resend:sync` command syncs all existing users
- [x] Graceful handling when API key is not configured
- [x] Duplicate contacts are handled by Resend (no errors)
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