Migrate backend to Porto architecture and fix minor bugs

- Fully transitioned the backend to the Porto architectural pattern
- Improved code organization and maintainability
- Fixed minor bugs and inconsistencies

app/Ship/Abstracts/Mails/Mailable.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace App\Ship\Abstracts\Mails;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable as LaravelMailable;
+use Illuminate\Queue\SerializesModels;
+
+abstract class Mailable extends LaravelMailable
+{
+    use Queueable, SerializesModels;
+}