chore: create user, collection and link models, migrations and seeders

app/models/collection.ts

@@ -0,0 +1,33 @@
+import AppBaseModel from '#models/app_base_model';
+import Link from '#models/link';
+import User from '#models/user';
+import { belongsTo, column, manyToMany } from '@adonisjs/lucid/orm';
+import type { BelongsTo, ManyToMany } from '@adonisjs/lucid/types/relations';
+
+export default class Collection extends AppBaseModel {
+  @column()
+  declare name: string;
+
+  @column()
+  declare description: string | null;
+
+  @column()
+  declare visibility: Visibility;
+
+  @column()
+  declare nextId: string;
+
+  @column()
+  declare authorId: string;
+
+  @belongsTo(() => User, { foreignKey: 'authorId' })
+  declare author: BelongsTo<typeof User>;
+
+  @manyToMany(() => Link)
+  declare links: ManyToMany<typeof Link>;
+}
+
+export enum Visibility {
+  PUBLIC = 'PUBLIC',
+  PRIVATE = 'PRIVATE',
+}