feat: add webshop offline maintenance mode with admin toggle and red maintenance screen

tests/Feature/AdminContentTest.php

@@ -257,4 +257,50 @@ class AdminContentTest extends TestCase
         $storagePath = str_replace('/storage/', '', $url);
         Storage::disk('public')->assertExists($storagePath);
     }
+
+    public function test_admin_can_toggle_webshop_offline_mode(): void
+    {
+        $this->assertEquals('0', Setting::get('shop_offline', '0'));
+
+        // Toggle offline via admin button
+        $response = $this->actingAs($this->admin)->post(route('admin.toggle-offline'));
+        $response->assertRedirect();
+        Setting::flushCache();
+        $this->assertEquals('1', Setting::get('shop_offline'));
+
+        // Logout admin so subsequent requests are unauthenticated guest requests
+        auth()->logout();
+        $this->flushSession();
+
+        // Guest visitor receives 503 with big red offline banner
+        $guestResponse = $this->get(route('home'));
+        $guestResponse->assertStatus(503);
+        $guestResponse->assertSee('Aan deze webshop wordt hard gewerkt', false);
+        $guestResponse->assertSee('Webshop Tijdelijk Offline');
+
+        // Other customer routes are blocked
+        $catalogResponse = $this->get(route('catalog'));
+        $catalogResponse->assertStatus(503);
+
+        // Login page remains accessible
+        $loginResponse = $this->get(route('login'));
+        $loginResponse->assertStatus(200);
+
+        // Admin can still view storefront normally with preview banner
+        $adminShopResponse = $this->actingAs($this->admin)->get(route('home'));
+        $adminShopResponse->assertStatus(200);
+        $adminShopResponse->assertSee('OFFLINE BEHEERDERS-PREVIEW');
+
+        // Toggle back online
+        $this->actingAs($this->admin)->post(route('admin.toggle-offline'));
+        Setting::flushCache();
+        $this->assertEquals('0', Setting::get('shop_offline'));
+
+        // Logout admin and verify guest can visit normally again
+        auth()->logout();
+        $this->flushSession();
+
+        $guestOnlineResponse = $this->get(route('home'));
+        $guestOnlineResponse->assertStatus(200);
+    }
 }

tests/TestCase.php

@@ -2,9 +2,14 @@
 
 namespace Tests;
 
+use App\Models\Setting;
 use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
 
 abstract class TestCase extends BaseTestCase
 {
-    //
+    protected function setUp(): void
+    {
+        parent::setUp();
+        Setting::flushCache();
+    }
 }