feat(auth): add email verification flow

templates/email_verify.html

@@ -0,0 +1,12 @@
+{% extends 'base.html' %}
+{% block title %}Verify email | Eternity Project{% endblock %}
+{% block content %}
+<section class="auth-layout">
+  <div class="auth-copy"><span class="signal-label">EMAIL VERIFICATION</span><h1>Confirm the<br>signal.</h1><p>{% if token_type == 'registration' %}Confirm {{ email }} to activate your account after administrator approval.{% else %}Confirm {{ email }} to replace the email address connected to your account.{% endif %}</p></div>
+  <form class="auth-form" method="post">
+    <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
+    <label>Email<input type="email" value="{{ email }}" readonly></label>
+    <button class="button" type="submit">Confirm email <span aria-hidden="true">→</span></button>
+  </form>
+</section>
+{% endblock %}