Add invite routes to backend and frontend; implement routing and UI components for invitation management

backend/src/index.js

@@ -106,6 +106,10 @@ app.use('/api/timewish', authenticateToken, timewishRouter);
 const rolesRouter = require('./routes/roles');
 app.use('/api/roles', authenticateToken, rolesRouter);
 
+// Invite routes (geschützt) - MIT ID-Hashing
+const inviteRouter = require('./routes/invite');
+app.use('/api/invite', authenticateToken, inviteRouter);
+
 // Error handling middleware
 app.use((err, req, res, next) => {
   console.error(err.stack);