fix: await JSON parsing in checkout API call

Ensures parsing errors are caught by surrounding try-catch for
consistent error handling

src/platform/cloud/subscription/components/PricingTable.vue

@@ -231,7 +231,7 @@ const initiateCheckout = async (tierKey: TierKey) => {
     )
   }
 
-  return response.json()
+  return await response.json()
 }
 
 const handleSubscribe = wrapWithErrorHandlingAsync(