Add multilingual support with translations for German, Russian, French, and Chinese

Added time limits and backup functions for servers

bin/check_expired_clients.php

@@ -0,0 +1,47 @@
+#!/usr/bin/env php
+<?php
+/**
+ * Check and disable expired VPN clients
+ * Run this script via cron to automatically disable clients that have expired
+ * 
+ * Example cron: 0 * * * * /usr/bin/php /var/www/html/bin/check_expired_clients.php
+ */
+
+require __DIR__ . '/../vendor/autoload.php';
+require __DIR__ . '/../inc/Config.php';
+require __DIR__ . '/../inc/DB.php';
+require __DIR__ . '/../inc/VpnClient.php';
+require __DIR__ . '/../inc/VpnServer.php';
+
+// Load environment
+Config::load(__DIR__ . '/../.env');
+
+try {
+    echo "[" . date('Y-m-d H:i:s') . "] Checking for expired clients...\n";
+    
+    // Disable all expired clients
+    $count = VpnClient::disableExpiredClients();
+    
+    if ($count > 0) {
+        echo "[" . date('Y-m-d H:i:s') . "] Disabled {$count} expired client(s)\n";
+    } else {
+        echo "[" . date('Y-m-d H:i:s') . "] No expired clients found\n";
+    }
+    
+    // Report expiring clients (within 7 days)
+    $expiring = VpnClient::getExpiringClients(7);
+    
+    if (count($expiring) > 0) {
+        echo "[" . date('Y-m-d H:i:s') . "] " . count($expiring) . " client(s) expiring soon:\n";
+        foreach ($expiring as $client) {
+            $daysLeft = (int)floor((strtotime($client['expires_at']) - time()) / 86400);
+            echo "  - {$client['name']} ({$client['email']}) expires in {$daysLeft} day(s)\n";
+        }
+    }
+    
+    exit(0);
+    
+} catch (Exception $e) {
+    echo "[" . date('Y-m-d H:i:s') . "] ERROR: " . $e->getMessage() . "\n";
+    exit(1);
+}