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/Scope.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Ship\Models;
+
+interface Scope
+{
+    /**
+     * Apply the scope to a given Eloquent query builder.
+     *
+     * @param Builder $builder
+     * @param Model $model
+     * @return void
+     */
+    public function apply(Builder $builder, Model $model);
+}