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

app/Http/Controllers/Admin/ContentController.php

@@ -85,6 +85,10 @@ class ContentController extends Controller
             'footer_shipping_text',
             'footer_copyright',
             'footer_payment_text',
+
+            // Offline / Maintenance Mode
+            'shop_offline_title',
+            'shop_offline_message',
         ];
 
         // Handle checkbox toggles that aren't present if unchecked
@@ -92,6 +96,10 @@ class ContentController extends Controller
             Setting::set('announcement_enabled', '0');
         }
 
+        if ($request->has('shop_offline_submitted')) {
+            Setting::set('shop_offline', $request->boolean('shop_offline') ? '1' : '0');
+        }
+
         foreach ($fields as $field) {
             if ($request->has($field)) {
                 $value = $request->input($field);
@@ -168,4 +176,20 @@ class ContentController extends Controller
                 ->with('error', "Fout bij verzenden van e-mail via {$defaultMailer}: ".$e->getMessage());
         }
     }
+
+    /**
+     * Toggle the webshop offline / online status.
+     */
+    public function toggleOffline(Request $request): RedirectResponse
+    {
+        $current = Setting::get('shop_offline', '0') === '1';
+        $new = ! $current;
+        Setting::set('shop_offline', $new ? '1' : '0');
+        Setting::flushCache();
+
+        $statusText = $new ? 'OFFLINE gezet' : 'weer ONLINE gezet';
+
+        return redirect()->back()
+            ->with('success', "De webshop is direct {$statusText}!");
+    }
 }