fix(pricing): sync custom model icons

- add the icon field to the pricing model type to consume model-level icons returned by the backend.
- prefer model icons in cards, table model cells, and detail headers while falling back to vendor icons.

web/default/src/features/pricing/components/pricing-columns.tsx

@@ -106,13 +106,14 @@ export function usePricingColumns(
       ),
       cell: ({ row }) => {
         const model = row.original
-        const vendorIcon = model.vendor_icon
-          ? getLobeIcon(model.vendor_icon, 14)
+        const modelIconKey = model.icon || model.vendor_icon
+        const modelIcon = modelIconKey
+          ? getLobeIcon(modelIconKey, 14)
           : null
 
         return (
           <div className='flex min-w-[200px] items-center gap-2'>
-            {vendorIcon}
+            {modelIcon}
             <span className='truncate font-mono text-sm font-medium'>
               {model.model_name}
             </span>