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>

config/express.js

@@ -57,9 +57,29 @@ module.exports = () => {
 
     app.use(session);
 
+app.use(flash());
+
 app.use(userMiddleware);
 
-app.use(flash());
+app.use((req, res, next) => {
+    res.set("X-PantryHub-Worktree", __dirname);
+    res.locals.user = req.user || null;
+    res.locals.success = req.flash("success");
+    res.locals.error = req.flash("error");
+    res.locals.info = req.flash("info");
+    res.locals.warning = req.flash("warning");
+    res.locals.title = "PantryHub";
+    next();
+});
+
+app.get("/__version", (req, res) => {
+    res.set("Cache-Control", "no-store");
+    res.json({
+        app: "PantryHub",
+        root: path.join(__dirname, ".."),
+        pid: process.pid
+    });
+});
 
 
     app.use(
@@ -69,6 +89,11 @@ app.use(flash());
     );
 
 
+    app.use(
+        "/api",
+        require("../routes/api")
+    );
+
     app.use(
         "/",
         require("../routes/auth")