Added admin layout

app/Domains/Admin/Controllers/AdminDashboardController.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Domains\Admin\Controllers;
+
+use App\Providers\InertiaProvider;
+use App\Scopes\CommonController;
+use Illuminate\Http\Request;
+use Inertia\Response;
+
+class AdminDashboardController extends CommonController
+{
+    public function __invoke(Request $request): Response
+    {
+        $inertiaProvider = new InertiaProvider('Admin/Dashboard', []);
+        return $inertiaProvider->render();
+    }
+}

app/Domains/Admin/Routes/web.php

@@ -0,0 +1,12 @@
+<?php
+
+use App\Domains\Admin\Controllers\AdminDashboardController;
+use App\Middleware\AdminRoleMiddleware;
+use App\Middleware\IdentifyTenant;
+use Illuminate\Support\Facades\Route;
+
+Route::middleware([IdentifyTenant::class, 'auth', AdminRoleMiddleware::class])->group(function () {
+    Route::prefix('admin')->group(function () {
+        Route::get('/', AdminDashboardController::class);
+    });
+});

app/Domains/Admin/Views/Dashboard.vue

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+<script setup>
+import AdminAppLayout from "../../../../resources/js/layouts/AdminAppLayout.vue";
+import ShadowedBox from "../../../Views/Components/ShadowedBox.vue";
+</script>
+
+<template>
+    <AdminAppLayout title="Administration">
+        <shadowed-box style="width: 95%; margin: 20px auto; padding: 20px; overflow-x: hidden;">
+            <h2>Administration</h2>
+        </shadowed-box>
+    </AdminAppLayout>
+</template>
+
+<style scoped>
+</style>

app/Middleware/AdminRoleMiddleware.php

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+<?php
+
+namespace App\Middleware;
+
+use App\Enumerations\UserRole;
+use App\Providers\AuthCheckProvider;
+use Closure;
+
+class AdminRoleMiddleware
+{
+    public function handle($request, Closure $next)
+    {
+        if (!auth()->check()) {
+            return redirect('/login')->with('message', 'Du musst eingeloggt sein.');
+        }
+
+        $authCheck = new AuthCheckProvider();
+        $role = $authCheck->getUserRole();
+
+        if (!in_array($role, [UserRole::USER_ROLE_ADMIN, UserRole::USER_ROLE_GROUP_LEADER], true)) {
+            return redirect('/')->with('message', 'Du bist dazu nicht berechtigt.');
+        }
+
+        return $next($request);
+    }
+}