Fix-ish frontend models, a generator and a generate command

frontend-reactive/app/models/origin-server.ts

@@ -0,0 +1,14 @@
+import Model, { attr } from '@ember-data/model'
+
+export default class OriginServer extends Model {
+  @attr() declare serverType: string
+  @attr() declare name: string
+  @attr() declare iconUrl: string
+  @attr() declare isSelf: boolean
+}
+
+declare module 'ember-data/types/registries/model' {
+  export default interface ModelRegistry {
+    originServer: OriginServer
+  }
+}