Add roles routes to backend and frontend; implement routing and UI components for admin roles management

backend/src/index.js

@@ -102,6 +102,10 @@ app.use('/api/password', authenticateToken, passwordRouter);
 const timewishRouter = require('./routes/timewish');
 app.use('/api/timewish', authenticateToken, timewishRouter);
 
+// Roles routes (geschützt, nur Admin) - MIT ID-Hashing
+const rolesRouter = require('./routes/roles');
+app.use('/api/roles', authenticateToken, rolesRouter);
+
 // Error handling middleware
 app.use((err, req, res, next) => {
   console.error(err.stack);