Function validate

Validates a FairyGUI project for common issues:

• Missing resource IDs
• Broken ui:// references (src pointing to non-existent resources)
• Empty components (no children)
• Controllers with no pages
• Duplicate resource IDs within a package

The validation result is stored in doc.getRoot().getExtras()._validation.

await doc.transform(validate({ throwOnError: true }));
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