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/Models/Pivot.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Ship\Models;
+
+use App\Ship\Abstracts\Models\Pivot as AbstractPivot;
+
+class Pivot extends AbstractPivot
+{
+
+}