Fix bugs across ExamTime

[Xenon010101]

��## Summary
Fixed 7+ bugs in the ExamTime codebase:

Bug Fixes

1. Fixed wrong model reference in deleteQuestion � used Request.findByIdAndDelete instead of Question.findByIdAndDelete; would throw ReferenceError at runtime
2. Fixed bare catch block missing error parameter � catch block lacked parameter, causing ReferenceError
3. Removed JWT token console leak � console.log(token) leaked auth tokens to server logs
4. Removed user object console leak � console.log(user) leaked sensitive user data
5. Removed debug console.log for OTP verification � leaked verification state
6. Removed JWT decoded data console leak in verifyToken middleware
7. Removed debug console.log in DocGrid component � leaked user object to browser console
8. Replaced console.log with console.error in catch blocks across Navbar, UploadPage, and user.controller

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[github-actions]

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