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/model-details.tsx

@@ -268,8 +268,9 @@ function OverviewSummaryGrid(props: { model: PricingModel }) {
 function ModelHeader(props: { model: PricingModel }) {
   const { t } = useTranslation()
   const model = props.model
-  const vendorIcon = model.vendor_icon
-    ? getLobeIcon(model.vendor_icon, 20)
+  const modelIconKey = model.icon || model.vendor_icon
+  const modelIcon = modelIconKey
+    ? getLobeIcon(modelIconKey, 20)
     : null
   const description = model.description || model.vendor_description || null
   const tags = parseTags(model.tags)
@@ -281,7 +282,7 @@ function ModelHeader(props: { model: PricingModel }) {
   return (
     <header className='pb-4'>
       <div className='flex items-center gap-2.5'>
-        {vendorIcon}
+        {modelIcon}
         <h1 className='font-mono text-xl font-bold tracking-tight sm:text-2xl'>
           {model.model_name}
         </h1>