✨ **Add public API documentation access and navigation links**

- 📚 Added "API Dokumentation" link to the sidebar and header navigation.
- 🔓 Defined `viewApiDocs` gate for public access to API documentation.
- ✅ Added feature tests for API documentation route accessibility and OpenAPI document serving.

tests/Feature/Api/ApiDocsAccessTest.php

@@ -0,0 +1,15 @@
+<?php
+
+use Illuminate\Support\Facades\Gate;
+
+it('exposes the api docs route publicly', function () {
+    expect(Gate::forUser(null)->allows('viewApiDocs'))->toBeTrue();
+});
+
+it('allows guests to open the api documentation', function () {
+    $this->get(route('scramble.docs.ui'))->assertSuccessful();
+});
+
+it('serves the openapi document to guests', function () {
+    $this->get(route('scramble.docs.document'))->assertSuccessful();
+});