Fix API docs generation with Scramble 0.13

Scramble 0.13 moved the collected resource type of resource collections
to a different template slot, which broke the custom paginated resource
collection extension and the API docs export. Scramble now infers
paginated responses natively, so the extension, the marker interface and
the @return annotations that overrode the inference are removed.

Scramble 0.13 also documents closure routes, so the API fallback routes
are moved to a controller that is excluded from the docs.

Add a test that exports the API docs.

app/Http/Controllers/Api/FallbackController.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use Dedoc\Scramble\Attributes\ExcludeAllRoutesFromDocs;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+
+/**
+ * Fallback for unknown /api/* routes, to prevent a rendered HTML page
+ */
+#[ExcludeAllRoutesFromDocs]
+class FallbackController extends Controller
+{
+    public function __invoke(): never
+    {
+        throw new NotFoundHttpException('API resource not found');
+    }
+}