Add widget management functionality: Implement getAvailableWidgets method in dashboardService to retrieve widget types, and create corresponding API endpoint in dashboardRouter. Update LoggedInView to allow users to select and add widgets dynamically, enhancing dashboard customization options.

backend/controllers/dashboardController.js

@@ -5,6 +5,17 @@ function getHashedUserId(req) {
 }
 
 export default {
+    /** Liste der möglichen Widget-Typen (öffentlich, keine Auth nötig wenn gewünscht – aktuell mit Auth). */
+    async getAvailableWidgets(req, res) {
+        try {
+            const list = await dashboardService.getAvailableWidgets();
+            res.json(list);
+        } catch (error) {
+            console.error('Dashboard getAvailableWidgets:', error);
+            res.status(500).json({ error: error.message || 'Internal server error' });
+        }
+    },
+
     async getConfig(req, res) {
         const hashedUserId = getHashedUserId(req);
         if (!hashedUserId) {