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

frontend-reactive/app/models/reaction.ts

@@ -1,9 +1,15 @@
 import Model, { attr } from '@ember-data/model'
 import type EmoteModel from './emote'
 
-export default class ReactionModel extends Model {
+export default class Reaction extends Model {
   @attr declare noteId: string
   @attr declare reactorId: string
   @attr declare emoteId: number
   @attr declare emote: EmoteModel
 }
+
+declare module 'ember-data/types/registries/model' {
+  export default interface ModelRegistry {
+    reaction: Reaction
+  }
+}