Copy Cart/Checkout Links:
- Added to GeneralTab for simple products (same pattern as variations)
- Link generation with add-to-cart and redirect params
Licensing Settings:
- 'Enable licensing for this product' checkbox in Additional Options
- License settings panel: activation limit, duration (days)
- State management in ProductFormTabbed
- Backend: ProductsController saves/loads licensing meta fields
Backend:
- _licensing_enabled, _license_activation_limit, _license_duration_days post meta
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