feat: Enhance product support in Cart and OrderItem models

- Added new fields 'billing_cycle' and 'product_pricing_id' to Cart and OrderItem models.
- Updated product retrieval logic to support both new and legacy systems.
- Introduced relationships for Product and ProductPricings in Cart and OrderItem models.
- Created migration to add new fields to the carts and order_item tables.
- Updated frontend service index to handle new pricing structure and billing cycles.
- Improved UI components for better user experience in product selection and pricing display.
- Refactored action buttons in various views for consistency and improved styling.

app/Models/Cart.php

@@ -16,14 +16,52 @@ class Cart extends Model
         'price',
         'quantity',
         'months',
+        'billing_cycle', // Add new field for billing cycle
+        'product_pricing_id', // Add new field to link to ProductPricings
     ];
 
+    /**
+     * Get product - support both new and legacy system
+     */
     public function product()
     {
+        // New flow: Check if product exists in Product table first
+        if ($this->product_id) {
+            $product = Product::find($this->product_id);
+            if ($product) {
+                return $product;
+            }
+        }
+
+        // Legacy flow: fallback to old system based on type_product
         return match ($this->type_product) {
             3 => $this->belongsTo(Hosting::class, 'product_id'),
             4 => $this->belongsTo(VPS::class, 'product_id'),
             default => null,
         };
     }
+
+    /**
+     * Relationship: Cart belongs to Product (new system)
+     */
+    public function productNew()
+    {
+        return $this->belongsTo(Product::class, 'product_id');
+    }
+
+    /**
+     * Relationship: Cart belongs to Customer
+     */
+    public function customer()
+    {
+        return $this->belongsTo(Customer::class, 'customer_id');
+    }
+
+    /**
+     * Relationship: Cart has pricing info
+     */
+    public function pricing()
+    {
+        return $this->belongsTo(ProductPricings::class, 'product_pricing_id');
+    }
 }