Refactor notification handling in FalukantService to improve data processing

- Convert notification rows to plain objects before enriching with character names, ensuring compatibility with subsequent processing.
- Update return structure to include plain notification objects, enhancing data consistency in the response.

backend/services/falukantService.js

@@ -5583,9 +5583,11 @@ class FalukantService extends BaseService {
             limit,
         });
 
-        await enrichNotificationsWithCharacterNames(rows);
+        // Convert to plain objects so we can add properties
+        const plainRows = rows.map(r => r.get({ plain: true }));
+        await enrichNotificationsWithCharacterNames(plainRows);
 
-        return { items: rows, total: count, page: Number(page) || 1, size: limit };
+        return { items: plainRows, total: count, page: Number(page) || 1, size: limit };
     }
 
     async markNotificationsShown(hashedUserId) {