feat: add product variant management functionality

- Implemented CreateProductVariantDto and UpdateProductVariantDto for product variant data transfer.
- Developed ProductVariantsController to handle CRUD operations for product variants.
- Created ProductVariantsService to interact with the database using Prisma.
- Added ProductVariantsModule to encapsulate the product variant feature.
- Included response mapping for consistent API responses.

src/generated/prisma/internal/prismaNamespaceBrowser.ts

@@ -53,8 +53,8 @@ export const AnyNull = runtime.AnyNull
 export const ModelName = {
   User: 'User',
   Role: 'Role',
+  ProductVariant: 'ProductVariant',
   Product: 'Product',
-  ProductInfo: 'ProductInfo',
   ProductBrand: 'ProductBrand',
   ProductCategory: 'ProductCategory',
   Supplier: 'Supplier',
@@ -104,16 +104,15 @@ export const RoleScalarFieldEnum = {
 export type RoleScalarFieldEnum = (typeof RoleScalarFieldEnum)[keyof typeof RoleScalarFieldEnum]
 
 
-export const ProductScalarFieldEnum = {
+export const ProductVariantScalarFieldEnum = {
   id: 'id',
   name: 'name',
+  basePrice: 'basePrice',
+  salePrice: 'salePrice',
   description: 'description',
-  sku: 'sku',
   barcode: 'barcode',
   imageUrl: 'imageUrl',
-  attachmentId: 'attachmentId',
   unit: 'unit',
-  discount: 'discount',
   quantity: 'quantity',
   alertQuantity: 'alertQuantity',
   isActive: 'isActive',
@@ -121,27 +120,26 @@ export const ProductScalarFieldEnum = {
   createdAt: 'createdAt',
   updatedAt: 'updatedAt',
   deletedAt: 'deletedAt',
-  productInfoId: 'productInfoId'
+  productId: 'productId'
 } as const
 
-export type ProductScalarFieldEnum = (typeof ProductScalarFieldEnum)[keyof typeof ProductScalarFieldEnum]
+export type ProductVariantScalarFieldEnum = (typeof ProductVariantScalarFieldEnum)[keyof typeof ProductVariantScalarFieldEnum]
 
 
-export const ProductInfoScalarFieldEnum = {
+export const ProductScalarFieldEnum = {
   id: 'id',
   name: 'name',
+  barcode: 'barcode',
+  sku: 'sku',
   description: 'description',
-  productType: 'productType',
-  metaData: 'metaData',
   createdAt: 'createdAt',
   updatedAt: 'updatedAt',
   deletedAt: 'deletedAt',
   brandId: 'brandId',
-  categoryId: 'categoryId',
-  supplierId: 'supplierId'
+  categoryId: 'categoryId'
 } as const
 
-export type ProductInfoScalarFieldEnum = (typeof ProductInfoScalarFieldEnum)[keyof typeof ProductInfoScalarFieldEnum]
+export type ProductScalarFieldEnum = (typeof ProductScalarFieldEnum)[keyof typeof ProductScalarFieldEnum]
 
 
 export const ProductBrandScalarFieldEnum = {
@@ -291,25 +289,25 @@ export const RoleOrderByRelevanceFieldEnum = {
 export type RoleOrderByRelevanceFieldEnum = (typeof RoleOrderByRelevanceFieldEnum)[keyof typeof RoleOrderByRelevanceFieldEnum]
 
 
-export const ProductOrderByRelevanceFieldEnum = {
+export const ProductVariantOrderByRelevanceFieldEnum = {
   name: 'name',
   description: 'description',
-  sku: 'sku',
   barcode: 'barcode',
   imageUrl: 'imageUrl',
   unit: 'unit'
 } as const
 
-export type ProductOrderByRelevanceFieldEnum = (typeof ProductOrderByRelevanceFieldEnum)[keyof typeof ProductOrderByRelevanceFieldEnum]
+export type ProductVariantOrderByRelevanceFieldEnum = (typeof ProductVariantOrderByRelevanceFieldEnum)[keyof typeof ProductVariantOrderByRelevanceFieldEnum]
 
 
-export const ProductInfoOrderByRelevanceFieldEnum = {
+export const ProductOrderByRelevanceFieldEnum = {
   name: 'name',
-  description: 'description',
-  productType: 'productType'
+  barcode: 'barcode',
+  sku: 'sku',
+  description: 'description'
 } as const
 
-export type ProductInfoOrderByRelevanceFieldEnum = (typeof ProductInfoOrderByRelevanceFieldEnum)[keyof typeof ProductInfoOrderByRelevanceFieldEnum]
+export type ProductOrderByRelevanceFieldEnum = (typeof ProductOrderByRelevanceFieldEnum)[keyof typeof ProductOrderByRelevanceFieldEnum]
 
 
 export const ProductBrandOrderByRelevanceFieldEnum = {