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/Product.php

@@ -79,6 +79,22 @@ class Product extends Model
         return $this->hasMany(ProductPricings::class, 'product_id');
     }
 
+    /**
+     * Relationship: Product has many order items
+     */
+    public function orderItems()
+    {
+        return $this->hasMany(OrderItem::class, 'product_id');
+    }
+
+    /**
+     * Relationship: Product has many orders through order items
+     */
+    public function orders()
+    {
+        return $this->hasManyThrough(Order::class, OrderItem::class, 'product_id', 'id', 'id', 'order_id');
+    }
+
     /**
      * Legacy: Many-to-many categories (if still needed)
      */
@@ -86,4 +102,31 @@ class Product extends Model
     {
         return $this->belongsToMany(ProductCategories::class, 'product_product_category', 'product_id', 'product_category_id');
     }
+
+    /**
+     * Get monthly pricing (or first available pricing)
+     */
+    public function getMonthlyPricingAttribute()
+    {
+        return $this->pricings()
+            ->where('is_active', 1)
+            ->where('billing_cycle', 'monthly')
+            ->first()
+            ?? $this->pricings()->where('is_active', 1)->orderBy('price')->first();
+    }
+
+    /**
+     * Get display price (sale price if available, otherwise regular price)
+     */
+    public function getPriceAttribute()
+    {
+        $pricing = $this->monthlyPricing;
+        return $pricing ? $pricing->price : 0;
+    }
+
+    public function getPriceSaleAttribute()
+    {
+        $pricing = $this->monthlyPricing;
+        return $pricing ? $pricing->price_sale : null;
+    }
 }