Refactor Validation and Server side code

[mathanraj0601]

Issue Title: Refactor Validation and Standardize Email Validation

Task :

• Refactor the validation logic for the result to improve code readability and maintainability.
• Implement standardized email validation using the Zod library better validation practices.
• Introduce global exception handling for Node.js and Express.js to handle errors uniformly across the application.
• Identify and move hardcoded strings to a separate file/constants file to centralize string management and enhance localization support.

[mathanraj0601]

Hi @Aryainguz .This is the continuation of issue #15

Could you kindly assign me to SWOC 24?

[Aryainguz]

@mathanraj0601 go ahead 🚀

[mathanraj0601]

That great @Aryainguz : )

[mathanraj0601]

Absolutely, @Aryainguz! 😊 I was thinking it might be more convenient for everyone if I create separate PRs for each task. This way, it'll be easier to review and manage. What do you think?