fix: align registerSchema bio/description validation with User model constraints

[Rishikapurbey]

Fixes #878

Summary

Fixes the validation inconsistency between registerSchema and the User model for bio and description.

Changes Made

• Made bio optional in registerSchema to match the model default value ("").
• Made description optional in registerSchema to match the model default value ("").
• Added .max(30) validation for bio to align with the model constraint.
• Added .max(200) validation for description to align with the model constraint.

Why

The User model treats bio and description as optional profile fields with empty string defaults, but the registration validator required both fields. This prevented users from registering without providing them. Additionally, the validator did not enforce the same maximum length limits defined in the model.

Result

The registration validator is now consistent with the User model, allowing registration without bio or description while still enforcing the correct character limits.

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