Add support for tracking last submitted form and booking object

- Introduced `last_submitted_form` and `form_submission` properties in the `form` class to retain details of the most recently submitted form.
- Updated form submission logic to assign `booking_object` where applicable.
- Enhanced response in `formRoute.php` to include booking data when available.

services/nginx/app/classes/form.php

@@ -14,6 +14,7 @@ use forms\objects\book_interior_wash_f;
 use forms\objects\book_wash_f;
 use forms\objects\complete_booking_f;
 use forms\objects\generate_booking_wash_certificate_f;
+use objects\form_submissions_o;
 use traits\form_t;
 
 /** Require the forms using glob */
@@ -40,6 +41,8 @@ class form
      * @var complete_booking_f $complete_booking_without_wash_certificate The COMPLETE_BOOKING_WITHOUT_WASH_CERTIFICATE form
      */
     public complete_booking_f $complete_booking_without_wash_certificate;
+    public $last_submitted_form;
+    public form_submissions_o $form_submission;
 
     public function __construct()
     {
@@ -59,6 +62,8 @@ class form
     {
         /** @var form_t|object $form */
         $form->submit();
+        $this->last_submitted_form = $form;
+        $this->form_submission = $form->form_submissions_o;
     }
 
     /**