Shipping Fix:
- Frontend now sends shipping_cost and shipping_title in order payload
- Backend uses these values as fallback when WC zone-based rate lookup fails
- Fixes issue where Rajaongkir and other API-based shipping wasn't applied
Dynamic Field Rendering:
- Added billingFields/shippingFields filters sorted by priority
- Added getBillingField/getShippingField helpers that return undefined for hidden fields
- All standard fields now conditionally rendered based on API response
- Fields use labels and required flags from API
- Any field can be hidden via PHP snippet (type: 'hidden' or hidden: true)
- Removed unused isFieldHidden function
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