🧱 Refactor: Convert userRoute to ES6 Module Syntax

Description

This pull request updates the userRoute file to use ES6 module syntax for modern structure and consistency with other routes.

Key Changes

• Converted all require statements to import.
• Added .js extensions to local imports.
• Replaced module.exports with export default router.
• Cleaned up redundant lines and standardized comments.

Notes

⚠️ The router has been refactored but not yet tested.
Further validation is required to ensure all endpoints work as expected under the ES6 setup.

• Test each route endpoint (/register, /login, /logout, /testProtectRoutes).
• Verify cookie handling and middleware compatibility.