Fix model images 404 under a subpath mount (withBase)

Model image URLs are root-relative (/api/models/image/...), so on an /ops
subpath deploy the raw <img src> resolved to the server root and 404'd. Wrap
every model-image src in withBase(): machine/printer/PC/network detail heroes,
the models settings preview, and the machine-badge / asset-label print pages.
withBase leaves external http(s)/data URLs untouched.

frontend/src/views/print/AssetLabel.vue

@@ -131,6 +131,7 @@ import { useRoute } from 'vue-router'
 import JsBarcode from 'jsbarcode'
 import { renderQrDataUrl } from './qrLogo'
 import { getSetting } from '@/utils/siteSettings'
+import { withBase } from '@/utils/basePath'
 import {
   TYPE_CONFIG, hasLocationType, resolveDefaultEncodes,
   effectiveEncodes as effEncodes, resolveCodeText as resolveText, captionFor,
@@ -171,7 +172,7 @@ const cardTitle = computed(() => {
 
 const imageUrl = computed(() => {
   const ext = extension.value
-  return (ext && ext.imageurl) ? ext.imageurl : null
+  return (ext && ext.imageurl) ? withBase(ext.imageurl) : null
 })
 
 // Small identity table shown on the card.

frontend/src/views/print/MachineBadge.vue

@@ -54,7 +54,7 @@ const modelName = computed(() => {
 const imageUrl = computed(() => {
   if (!machine.value) return null
   const img = machine.value.machine?.imageurl
-  if (img) return img.startsWith('/') ? img : `/images/models/machines/${img}`
+  if (img) return withBase(img.startsWith('/') ? img : `/images/models/machines/${img}`)
   return null
 })