Send signed outgoing webhooks

Fed by the records themselves, delivered only to public HTTPS addresses
checked at every attempt, retried, and switched off after repeated failures.
A submitter's details travel only to webhooks that opted into them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/Http/Resources/WebhookDeliveryResource.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Resources;
+
+use App\Models\WebhookDelivery;
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/**
+ * @mixin WebhookDelivery
+ */
+class WebhookDeliveryResource extends JsonResource
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'uuid' => $this->uuid,
+            'event' => $this->event,
+            'status' => $this->status,
+            'attempts' => (int) $this->attempts,
+            'response_status' => $this->response_status,
+            'error' => $this->error,
+            'payload' => (object) ($this->payload ?? []),
+            'delivered_at' => $this->delivered_at?->toIso8601String(),
+            'created_at' => $this->created_at?->toIso8601String(),
+        ];
+    }
+}