feat: Implement order and invoice management, enhance addon features, and remove the 'Type' module.

app/Models/Cart.php

@@ -64,4 +64,22 @@ class Cart extends Model
     {
         return $this->belongsTo(ProductPricings::class, 'product_pricing_id');
     }
+
+    /**
+     * Relationship: Cart has many addons
+     */
+    public function addons()
+    {
+        return $this->hasMany(CartAddon::class, 'cart_id');
+    }
+
+    /**
+     * Get total price including addons
+     */
+    public function getTotalPriceAttribute()
+    {
+        $basePrice = $this->price * $this->quantity;
+        $addonsPrice = $this->addons->sum('price');
+        return $basePrice + $addonsPrice;
+    }
 }