Review, publish, preview and undo changes through the API

Revisions now call publishing only what publishes: a project's status is
whether the work is active, and a service is published by its flag.

The fake identity server answers by token, so a test can sign in a second
person.

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

app/Http/Controllers/Api/V1/PreviewController.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Controllers\Api\V1;
+
+use App\Http\Controllers\Api\V1\Concerns\ResolvesContent;
+use App\Http\Controllers\Controller;
+use App\Support\AdminContent;
+use App\Support\PreviewLink;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+/**
+ * Links to see a draft on the real site, one per language it has an address
+ * in — the panel's preview button. Each opens that one record only, and stops
+ * working after `PreviewLink::HOURS`.
+ */
+class PreviewController extends Controller
+{
+    use ResolvesContent;
+
+    public function store(Request $request): JsonResponse
+    {
+        $record = $this->record($request);
+
+        $this->authorize('view', $record);
+
+        $type = AdminContent::PREVIEWABLE[$this->content($request)];
+
+        $links = collect(array_keys((array) config('locales.supported')))
+            ->mapWithKeys(fn (string $locale) => [$locale => PreviewLink::for($record, $type, $locale)])
+            ->filter()
+            ->all();
+
+        return response()->json([
+            'data' => [
+                'links' => (object) $links,
+                'expires_at' => now()->addHours(PreviewLink::HOURS)->toIso8601String(),
+            ],
+        ], 201);
+    }
+}