Migrate Joi schemas and associated types to Zod

[phoenix-server]

Migrate validation schemas from Joi to Zod for better type safety and integration with TypeScript.

[YashIIT0909]

@phoenix-server , I would like to work on this issue !

[CKodidela]

I would like to work on this as all my assigned issues are closed.

[Mohit-Davar]

Can I work on this issue? I have already worked with Joi in this project and have strong experience with Zod.

[archief2910]

Hi @phoenix-server ,@cameri , Could you please assign this to me ?