Add initial KioskCore and API endpoint for data analysis

- Created a new CSS file for kiosk styles, defining variables, typography, and layout for cards and toolbars.
- Implemented new routes for data anlaysis page

realtime/src/routes/kiosk.js

@@ -0,0 +1,12 @@
+const router = require('express').Router();
+const db = require('../store/db');
+
+// Endpoint per ricevere dati dal kiosk
+router.post('/data', async (req, res) => {
+    const { session_id, sensor_code, value, timestamp } = req.body;
+    if (!session_id || !sensor_code || value === undefined) {
+        return res.status(400).json({ error: 'Missing required fields' });
+    }
+});
+
+module.exports = router;