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/settings/ModelsList.vue

@@ -136,7 +136,7 @@
             <div class="form-group">
               <label>Image</label>
               <div class="image-manage">
-                <img v-if="form.imageurl" :src="form.imageurl" alt="Model image" class="image-thumb" />
+                <img v-if="form.imageurl" :src="withBase(form.imageurl)" alt="Model image" class="image-thumb" />
                 <div class="image-actions">
                   <template v-if="editingModel">
                     <input
@@ -209,6 +209,7 @@ import { modelsApi, vendorsApi, modeltypesApi } from '../../api'
 import PaginationBar from '../../components/PaginationBar.vue'
 import { useToast } from '../../composables/toast'
 import { apiError } from '../../utils/apiError'
+import { withBase } from '@/utils/basePath'
 import { useListQuery } from '@/composables/listQuery'
 const toast = useToast()