feat(bookstack) : add BookStackTestConnection API resource

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

src/State/BookStackTestConnectionProvider.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\State;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\State\ProcessorInterface;
+use ApiPlatform\State\ProviderInterface;
+use App\ApiResource\BookStackTestConnection;
+use App\Service\BookStackApiService;
+
+final readonly class BookStackTestConnectionProvider implements ProviderInterface, ProcessorInterface
+{
+    public function __construct(
+        private BookStackApiService $bookStackApiService,
+    ) {}
+
+    public function provide(Operation $operation, array $uriVariables = [], array $context = []): BookStackTestConnection
+    {
+        return new BookStackTestConnection();
+    }
+
+    public function process(mixed $data, Operation $operation, array $uriVariables = [], array $context = []): BookStackTestConnection
+    {
+        $result          = new BookStackTestConnection();
+        $result->success = $this->bookStackApiService->testConnection();
+
+        return $result;
+    }
+}