Added validation for email while signing up.

[Anuj-Gill]

Issue While signing up, invalid email formats were not being handled correctly.

Description: Added Zod validation for email to ensure correct format during signup. Implemented a structured error response with HTTP status code 400 for invalid emails. Enhanced error message clarity and consistency with best practices.

Checklist:

• I have tested my changes.
• My code follows the project's coding standards.

Screenshots: If the user enters email in wrong format, ie. test@gmail, test@a or something, the user will see this:

The user requires to enter the mail in correct format ie test@gmail.co or com or something test@(something).(something like co, com, in etc)

[vercel[bot]]

Someone is attempting to deploy a commit to a Personal Account owned by @ani1609 on Vercel.

@ani1609 first needs to authorize it.

[vercel[bot]]

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[ani1609]

@Anuj-Gill i just tried to signup with an email 'mail@tt' and it got be signed up without giving any error!!

[Anuj-Gill]

@ani1609 But it's giving me an error when i am running it locally.