feat: add basic admin dashboard

app/middleware/admin_middleware.ts

@@ -0,0 +1,11 @@
+import type { HttpContext } from '@adonisjs/core/http';
+import type { NextFn } from '@adonisjs/core/types/http';
+
+export default class AdminMiddleware {
+  async handle(ctx: HttpContext, next: NextFn) {
+    if (!ctx.auth.user?.isAdmin) {
+      return ctx.response.redirectToNamedRoute('dashboard');
+    }
+    return next();
+  }
+}