Function validate 

pub fn validate(type_name: &str, json: &str) -> JsValue

Validate JSON data against a registered type.

Arguments

• type_name - The name of the type to validate against (e.g., “Booking”)
• json - JSON string to validate

Returns

A ValidationResult object (always, never throws):

• { ok: true } - Validation passed
• { ok: false, errors: [...] } - Validation failed
• { ok: false, error: { code, message } } - System error