Fix TypeScript unused variable errors

server/index.ts

@@ -64,7 +64,7 @@ if (isProduction) {
   app.use(express.static(clientPath));
   
   // SPA fallback
-  app.get('*', (req, res) => {
+  app.get('*', (_req, res) => {
     res.sendFile(path.join(clientPath, 'index.html'));
   });
 }

server/routes/admin.ts

@@ -10,7 +10,7 @@ const router = Router();
 router.use(requireAuth);
 
 // Get all questionnaires
-router.get('/questionnaires', (req: Request, res: Response) => {
+router.get('/questionnaires', (_req: Request, res: Response) => {
   const questionnaires = questionnaireOps.getAll();
   res.json(questionnaires);
 });
@@ -207,7 +207,7 @@ router.delete('/activities/:id', (req: Request, res: Response) => {
 });
 
 // Get all users
-router.get('/users', (req: Request, res: Response) => {
+router.get('/users', (_req: Request, res: Response) => {
   const users = userOps.getAll();
   res.json(users);
 });

server/routes/questionnaire.ts

@@ -125,7 +125,7 @@ router.post('/:slug/set-name', (req: Request, res: Response) => {
 });
 
 // Clear visitor name
-router.post('/:slug/clear-name', (req: Request, res: Response) => {
+router.post('/:slug/clear-name', (_req: Request, res: Response) => {
   res.clearCookie('visitorName');
   res.clearCookie('participantToken');
   res.json({ success: true });