Applicatie afmaken en GUI-flow herstellen

Voegt boodschappenlijsten, productbeheer, realtime synchronisatie en browsercache-updates toe. Herstelt login- en sessiegedrag en maakt database-seeding herhaalbaar.\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

routes/api.js

@@ -0,0 +1,8 @@
+const router = require("express").Router();
+const auth = require("../middleware/auth");
+const ProductRepository = require("../repositories/ProductRepository");
+
+router.use(auth);
+router.get("/products", (req, res) => res.json(ProductRepository.getAll()));
+
+module.exports = router;