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.

database/migrations/2026_02_08_210451_add_product_support_to_carts_and_order_items_tables.php

@@ -0,0 +1,60 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        // Add support for new Product system to carts table
+        Schema::table('carts', function (Blueprint $table) {
+            if (!Schema::hasColumn('carts', 'billing_cycle')) {
+                $table->string('billing_cycle', 50)->nullable()->after('months')->comment('Billing cycle: monthly, semi_annually, annually, etc.');
+            }
+            if (!Schema::hasColumn('carts', 'product_pricing_id')) {
+                $table->unsignedBigInteger('product_pricing_id')->nullable()->after('billing_cycle')->comment('Link to product_pricings table');
+                $table->index('product_pricing_id');
+            }
+            
+            // Make type_product nullable for new Product system
+            $table->integer('type_product')->nullable()->change();
+        });
+
+        // Add support for new Product system to order__order_item table
+        Schema::table('order__order_item', function (Blueprint $table) {
+            if (!Schema::hasColumn('order__order_item', 'billing_cycle')) {
+                $table->string('billing_cycle', 50)->nullable()->after('months')->comment('Billing cycle: monthly, semi_annually, annually, etc.');
+            }
+            if (!Schema::hasColumn('order__order_item', 'product_pricing_id')) {
+                $table->unsignedBigInteger('product_pricing_id')->nullable()->after('billing_cycle')->comment('Link to product_pricings table');
+                $table->index('product_pricing_id');
+            }
+            
+            // Make product_type nullable for new Product system
+            if (Schema::hasColumn('order__order_item', 'product_type')) {
+                $table->integer('product_type')->nullable()->change();
+            }
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('carts', function (Blueprint $table) {
+            $table->dropColumn(['billing_cycle', 'product_pricing_id']);
+            $table->dropIndex(['product_pricing_id']);
+        });
+
+        Schema::table('order__order_item', function (Blueprint $table) {
+            $table->dropColumn(['billing_cycle', 'product_pricing_id']);
+            $table->dropIndex(['product_pricing_id']);
+        });
+    }
+};