refactor(TrafficRoutes): remove deprecated interface speed test endpoint to streamline API

backend/server.js

@@ -468,11 +468,6 @@ app.post('/api/mikrotik/run-script', mikrotikConfigRoutes.runScript);
 
 // === TRAFFIC STATS (MikroTik interfaces by jumphost) ===
 app.get('/api/traffic/interface-stats', trafficRoutes.getInterfaceStats);
-app.post(
-  '/api/traffic/interface-speed-test',
-  writeLimiter,
-  trafficRoutes.measureInterfaceSpeed
-);
 
 // === MIKROTIK BACKUPS (S3) ===
 app.post('/api/mikrotik/backups', writeLimiter, mikrotikBackupRoutes.createBackup);