feat: add CORS configuration to template vite configs

[quangnnbb]

Description

This PR adds CORS configuration to the vite.config.js files in the basics, minimal, and necessary templates to improve the development experience for Shopify theme development.

Changes

• Added CORS configuration to templates/basics/vite.config.js
• Added CORS configuration to templates/minimal/vite.config.js
• Added CORS configuration to templates/necessary/vite.config.js

Benefits

• Allows cross-origin requests from Shopify domains (*.myshopify.com, *.shopify.com, admin.shopify.com, *.shopifycdn.com)
• Enables credentials for authenticated requests
• Supports common HTTP methods (GET, POST, PUT, DELETE, OPTIONS)
• Improves development workflow when working with Shopify themes

Testing

• Verified CORS configuration works with Shopify development environment
• Tested with multiple template types (basics, minimal, necessary)

Type of Change

• Enhancement (non-breaking change which adds functionality)

[lukecharle]

This project is dead and not maintained. You should look to use something like https://shopify-vite.barrelny.com/ instead.