added notification and cancellation mail

public/fetch_available_classes.php

@@ -0,0 +1,26 @@
+<?php
+require_once('include/headscript.php');
+
+$conn = mysqli_connect($servername, $username, $password, $dbname);
+
+if (!$conn) {
+    die(json_encode(['error' => 'Connessione al database fallita']));
+}
+
+// Query per ottenere tutte le classi disponibili
+$sql = "SELECT id, servicename, day, time FROM classes ORDER BY servicename, day, time";
+$result = mysqli_query($conn, $sql);
+
+$classes = [];
+while ($row = mysqli_fetch_assoc($result)) {
+    $classes[] = [
+        'id' => $row['id'],
+        'servicename' => $row['servicename'],
+        'day' => $row['day'],
+        'time' => $row['time']
+    ];
+}
+
+mysqli_close($conn);
+header('Content-Type: application/json');
+echo json_encode($classes);