Manage webhooks from the panel

Create one and see its secret once, send a test, change the secret, and read
each delivery with what the other end answered.

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

app/Http/Requests/Api/V1/WebhookRequest.php

@@ -5,8 +5,7 @@ declare(strict_types=1);
 namespace App\Http\Requests\Api\V1;
 
 use App\Models\Webhook;
-use App\Support\Webhooks\PublicEndpoint;
-use Closure;
+use App\Rules\PublicHttpsUrl;
 use Illuminate\Foundation\Http\FormRequest;
 use Illuminate\Validation\Rule;
 
@@ -34,13 +33,7 @@ class WebhookRequest extends FormRequest
                 'max:2048',
                 // Refused now rather than at the first delivery; checked
                 // again at every delivery all the same.
-                function (string $attribute, mixed $value, Closure $fail): void {
-                    [, $reason] = app(PublicEndpoint::class)->check((string) $value);
-
-                    if ($reason !== null) {
-                        $fail(__("rules.media.remote.{$reason}"));
-                    }
-                },
+                new PublicHttpsUrl,
             ],
             'events' => [$sometimes, 'array', 'min:1'],
             'events.*' => ['string', 'distinct', Rule::in(['*', ...Webhook::EVENTS])],