feat : add branch name generation endpoint

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

src/ApiResource/GiteaBranchName.php

@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\ApiResource;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Get;
+use App\State\GiteaBranchNameProvider;
+use Symfony\Component\Serializer\Attribute\Groups;
+
+#[ApiResource(
+    operations: [
+        new Get(
+            uriTemplate: '/tasks/{taskId}/gitea/branch-name/{type}',
+            normalizationContext: ['groups' => ['gitea_branch_name:read']],
+            provider: GiteaBranchNameProvider::class,
+        ),
+    ],
+)]
+final class GiteaBranchName
+{
+    #[Groups(['gitea_branch_name:read'])]
+    public string $name = '';
+}