Add public token-gated kitchen display for POS devices.

Kitchen display devices open a full-screen KDS without staff login,
with feed/stream/bump over the device token. Shared kitchen board
logic is extracted so the signed-in Kitchen page stays in sync.

app/Services/Pos/DeviceService.php

@@ -122,7 +122,7 @@ class DeviceService
 
         return match ($device->type) {
             'customer_display' => route('pos.customer-display.show', ['token' => $device->device_token]),
-            'kitchen_display' => route('pos.kitchen'),
+            'kitchen_display' => route('pos.kitchen-display.show', ['token' => $device->device_token]),
             default => null,
         };
     }