Add password change routes to backend and frontend; update routing and UI components for password management

backend/src/index.js

@@ -94,6 +94,10 @@ app.use('/api/holidays', authenticateToken, holidaysRouter);
 const profileRouter = require('./routes/profile');
 app.use('/api/profile', authenticateToken, profileRouter);
 
+// Password routes (geschützt) - MIT ID-Hashing
+const passwordRouter = require('./routes/password');
+app.use('/api/password', authenticateToken, passwordRouter);
+
 // Error handling middleware
 app.use((err, req, res, next) => {
   console.error(err.stack);