add Emailer and EmailFactory interfaces with laravel + fake impls

backend/app/Email/LaravelMailer.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Email;
+
+use Illuminate\Contracts\Mail\Mailer;
+use Illuminate\Mail\Message;
+
+class LaravelMailer implements Emailer
+{
+    public function __construct(
+        private Mailer $mailer,
+    ) {}
+
+    public function send(string $from, string $to, string $body): void
+    {
+        $this->mailer->raw(
+            $body,
+            function (Message $message) use ($from, $to) {
+                $message->from($from)
+                    ->to($to)
+                    ->subject('TIDE');
+            }
+        );
+    }
+}