feat(cms): expose public document api and trigger site revalidation

app/Observers/DocumentObserver.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace App\Observers;
+
+use App\Models\Document;
+use App\Services\SiteRevalidationService;
+
+class DocumentObserver
+{
+    private const RELEVANT_FIELDS = [
+        'title',
+        'document_number',
+        'description',
+        'document_category_id',
+        'access_level',
+        'status',
+        'archived_at',
+        'current_version_id',
+        'version_count',
+        'expires_at',
+        'auto_archive_on_expiry',
+        'expiry_notice',
+        'deleted_at',
+    ];
+
+    public function created(Document $document): void
+    {
+        $this->revalidate($document);
+    }
+
+    public function updated(Document $document): void
+    {
+        if (! $document->wasChanged(self::RELEVANT_FIELDS)) {
+            return;
+        }
+
+        $this->revalidate($document);
+    }
+
+    public function deleted(Document $document): void
+    {
+        $this->revalidate($document);
+    }
+
+    public function restored(Document $document): void
+    {
+        $this->revalidate($document);
+    }
+
+    private function revalidate(Document $document): void
+    {
+        SiteRevalidationService::revalidateDocument($document->public_uuid);
+    }
+}