Reorganize app workspaces and align Admin architecture

apps/backend/database/migrations/1750267695799_create_admin_roles_table.ts

@@ -0,0 +1,20 @@
+import { BaseSchema } from '@adonisjs/lucid/schema'
+
+export default class extends BaseSchema {
+  protected tableName = 'admin_roles'
+
+  async up() {
+    this.schema.createTable(this.tableName, (table) => {
+      table.increments('id')
+      table.integer('role_id').unsigned().references('id').inTable('roles').onDelete('CASCADE')
+      table.integer('admin_id').unsigned().references('id').inTable('admins').onDelete('CASCADE')
+      table.unique(['role_id', 'admin_id'])
+      table.timestamp('created_at')
+      table.timestamp('updated_at')
+    })
+  }
+
+  async down() {
+    this.schema.dropTable(this.tableName)
+  }
+}