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/lib/prisma.ts

@@ -1,17 +1,17 @@
 import { PrismaMariaDb } from '@prisma/adapter-mariadb'
-// import 'dotenv/config'
+import 'dotenv/config'
+import { env } from 'prisma/config'
+
 import { PrismaClient } from '../generated/prisma/client'
 
-console.log('@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@')
-console.log(process.env.DATABASE_HOST)
-
 const adapter = new PrismaMariaDb({
-  host: process.env.DATABASE_HOST,
-  user: process.env.DATABASE_USER,
-  password: process.env.DATABASE_PASSWORD,
-  database: process.env.DATABASE_NAME,
+  host: env('DATABASE_HOST'),
+  user: env('DATABASE_USER'),
+  password: env('DATABASE_PASSWORD'),
+  database: env('DATABASE_NAME'),
   connectionLimit: 5,
 })
+
 const prisma = new PrismaClient({ adapter })
 
 export { prisma }