Refactor VerifyEmailController to use fulfill()

[michaelnabil230]

This pull request refactors the VerifyEmailController to utilize the built-in fulfill() method provided by EmailVerificationRequest.

By replacing the manual email verification logic with a call to $request->fulfill(), we align the implementation with Laravel’s internal conventions, improving code readability, maintainability, and reducing redundancy.

Changes:

• Replaced manual hasVerifiedEmail() check, markEmailAsVerified() call, and Verified event dispatch with a single $request->fulfill() method call.
• Preserved the existing redirect behavior after verification.

Benefits:

• Cleaner, more idiomatic Laravel code.
• Leverages framework-provided method designed for this exact purpose.
• Easier future maintenance and consistency with Laravel best practices.