feat: complete email infrastructure with queue, templates, logging, and API

Adds the full transactional email system:
- Redis queue (QUEUE_CONNECTION=redis), SES config in .env.example
- 3 migrations: organisation_email_settings, organisation_email_templates, email_logs
- EmailTemplateType and EmailLogStatus enums with Dutch defaults
- EmailService as central entry point for all email sending
- SendTransactionalEmail queued job with retries and idempotency
- TransactionalMail mailable with responsive HTML + plain text templates
- Organisation-level branding (colors, logo, footer, reply-to)
- Per-type template overrides with {variable} substitution
- Email log with filtering by status, type, date range, recipient
- Preview and send-test endpoints for template management
- API endpoints: email-settings, email-templates (CRUD), email-logs (read-only)
- Integrated into existing flows: invitations, password reset, email
  verification, registration approval/rejection
- 37 new tests across 4 test files, all existing tests updated

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/Services/InvitationService.php

@@ -4,16 +4,19 @@ declare(strict_types=1);
 
 namespace App\Services;
 
-use App\Mail\InvitationMail;
+use App\Enums\EmailTemplateType;
 use App\Models\Organisation;
 use App\Models\User;
 use App\Models\UserInvitation;
-use Illuminate\Support\Facades\Mail;
 use Illuminate\Support\Str;
 use Illuminate\Validation\ValidationException;
 
 final class InvitationService
 {
+    public function __construct(
+        private readonly EmailService $emailService,
+    ) {}
+
     public function invite(Organisation $org, string $email, string $role, User $invitedBy): UserInvitation
     {
         $existingInvitation = UserInvitation::where('email', $email)
@@ -50,7 +53,17 @@ final class InvitationService
         // Set transient plain token for use in the email URL
         $invitation->plainToken = $plainToken;
 
-        Mail::to($email)->queue(new InvitationMail($invitation));
+        $this->emailService->send(
+            type: EmailTemplateType::INVITATION,
+            recipientEmail: $email,
+            recipientName: $email,
+            variables: [
+                'organisation_name' => $org->name,
+            ],
+            actionUrl: config('app.frontend_app_url') . '/invitations/' . $plainToken . '/accept',
+            organisation: $org,
+            triggeredByUserId: $invitedBy->id,
+        );
 
         activity('invitation')
             ->performedOn($invitation)