Add holidays routes to backend and frontend; implement holiday associations and update UI components for admin holidays management

backend/src/index.js

@@ -86,6 +86,10 @@ app.use('/api/workdays', authenticateToken, workdaysRouter);
 const calendarRouter = require('./routes/calendar');
 app.use('/api/calendar', authenticateToken, calendarRouter);
 
+// Holidays routes (geschützt, nur Admin) - MIT ID-Hashing
+const holidaysRouter = require('./routes/holidays');
+app.use('/api/holidays', authenticateToken, holidaysRouter);
+
 // Error handling middleware
 app.use((err, req, res, next) => {
   console.error(err.stack);