[Feature]: Add Zod Input Validation to User Schema

[Shreyanshi210205]

So, what is it about?

We currently do not have strict input validation for the User schema. This can lead to inconsistent or invalid user data being stored or processed.
We should integrate Zod to validate user input at both the API and model level.

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[Shreyanshi210205]

@04shubham7 Please assign this issue to me and add labels to the issue created.
Approach:-
1.Add a Zod schema (userSchema) that defines the structure and validation rules for the User object.
2.Include validation for:
-name: required string, min 2 characters
-email: valid email address
3.Ensure backend routes or functions that create/update users use the Zod schema for validation (.parse() or .safeParse()).