ChawkBazar Laravel - React, Next, REST API Ecommerce With Multivendor 6.8.0

- Upgraded Admin to Next.js, along with all associated packages for improved performance and compatibility [Enhancement]
- Upgraded Shop to Next.js, updating all dependencies for enhanced stability and features.[Enhancement]

- Added "Become a Seller" functionality [New Feature]
- Implemented multi-commission support for different commission rates [New Feature]
- Internal bug fixes [Bug Fix]