Added backends/spec API endpoint.

src/API/Backends/Spec.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\API\Backends;
+
+use App\Libs\Attributes\Route\Get;
+use App\Libs\HTTP_STATUS;
+use App\Libs\Traits\APITraits;
+use Psr\Http\Message\ResponseInterface as iResponse;
+use Psr\Http\Message\ServerRequestInterface as iRequest;
+
+final class Spec
+{
+    use APITraits;
+
+    #[Get(Index::URL . '/spec[/]', name: 'backends.spec')]
+    public function __invoke(iRequest $request, array $args = []): iResponse
+    {
+        $specs = require __DIR__ . '/../../../config/servers.spec.php';
+
+        $list = [];
+
+        foreach ($specs as $spec) {
+            $item = [
+                'key' => $spec['key'],
+                'type' => $spec['type'],
+                'description' => $spec['description'],
+            ];
+
+            if (ag_exists($spec, 'choices')) {
+                $item['choices'] = $spec['choices'];
+            }
+
+            $list[] = $item;
+        }
+
+        return api_response(HTTP_STATUS::HTTP_OK, $list);
+    }
+}