feat(bookstack) : add BookStackSettings API resource with provider and processor

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ApiResource/BookStackSettings.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\ApiResource;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Get;
+use ApiPlatform\Metadata\Put;
+use App\State\BookStackSettingsProcessor;
+use App\State\BookStackSettingsProvider;
+use Symfony\Component\Serializer\Attribute\Groups;
+
+#[ApiResource(
+    operations: [
+        new Get(
+            uriTemplate: '/settings/bookstack',
+            normalizationContext: ['groups' => ['bookstack_settings:read']],
+            provider: BookStackSettingsProvider::class,
+            security: "is_granted('ROLE_ADMIN')",
+        ),
+        new Put(
+            uriTemplate: '/settings/bookstack',
+            denormalizationContext: ['groups' => ['bookstack_settings:write']],
+            normalizationContext: ['groups' => ['bookstack_settings:read']],
+            provider: BookStackSettingsProvider::class,
+            processor: BookStackSettingsProcessor::class,
+            security: "is_granted('ROLE_ADMIN')",
+        ),
+    ],
+)]
+final class BookStackSettings
+{
+    #[Groups(['bookstack_settings:read', 'bookstack_settings:write'])]
+    public ?string $url = null;
+
+    #[Groups(['bookstack_settings:write'])]
+    public ?string $tokenId = null;
+
+    #[Groups(['bookstack_settings:write'])]
+    public ?string $tokenSecret = null;
+
+    #[Groups(['bookstack_settings:read'])]
+    public bool $hasToken = false;
+}