Implement existing API types

frontend-reactive/app/models/media-metadata.ts

@@ -0,0 +1,12 @@
+import Model, { attr } from '@ember-data/model'
+
+export default class MediaMetadataModel extends Model {
+  @attr declare createdAt: Date
+  @attr declare updatedAt: Date
+  @attr declare isRemote: boolean
+  @attr declare url: string
+  @attr declare mimeType: string
+  @attr declare name: string
+  @attr declare altText: string
+  @attr declare blurred: boolean
+}