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/Seo.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace App\Ship\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+
+class Seo extends Model
+{
+    use HasFactory;
+
+    protected $fillable = ['title', 'description'];
+
+    public function seoable()
+    {
+        return $this->morphTo();
+    }
+}