🎉 Verbesserte Backend-Funktionalität durch Windows-sichere Disk-Usage-Bestimmung, Uptime-Berechnung und Einführung eines Kiosk-Timers. Dokumentation aktualisiert und nicht mehr benötigte Dateien entfernt. 🧹

backend/app.py

@@ -6321,14 +6321,53 @@ def api_admin_stats_live():
             cpu_percent = psutil.cpu_percent(interval=1)
             memory_percent = psutil.virtual_memory().percent
             
-            # Disk-Pfad sicher bestimmen
-            disk_path = '/' if os.name != 'nt' else 'C:\\'
-            disk_percent = psutil.disk_usage(disk_path).percent
+            # Windows-sichere Disk-Usage-Bestimmung
+            disk_percent = 0.0
+            try:
+                if os.name == 'nt':  # Windows
+                    # Windows: Verwende sicheren Pfad-Ansatz
+                    import string
+                    
+                    # Versuche verschiedene Windows-Laufwerke
+                    drives_to_check = ['C:', 'D:', 'E:']
+                    
+                    for drive in drives_to_check:
+                        try:
+                            # Prüfe ob Laufwerk existiert
+                            if os.path.exists(drive + '\\'):
+                                disk_usage = psutil.disk_usage(drive + '\\')
+                                disk_percent = disk_usage.percent
+                                break
+                        except (OSError, SystemError) as drive_error:
+                            app_logger.debug(f"Laufwerk {drive} nicht verfügbar: {str(drive_error)}")
+                            continue
+                    
+                    # Fallback: Verwende os.statvfs alternative
+                    if disk_percent == 0.0:
+                        try:
+                            import shutil
+                            total, used, free = shutil.disk_usage('C:\\')
+                            disk_percent = (used / total) * 100.0
+                        except Exception as shutil_error:
+                            app_logger.debug(f"Shutil disk_usage fehlgeschlagen: {str(shutil_error)}")
+                            disk_percent = 0.0
+                            
+                else:  # Unix/Linux
+                    # Unix: Standard-Pfad verwenden
+                    disk_percent = psutil.disk_usage('/').percent
+                    
+            except Exception as disk_error:
+                app_logger.warning(f"Disk-Usage-Bestimmung fehlgeschlagen: {str(disk_error)}")
+                disk_percent = 0.0
             
             # Uptime sicher berechnen
-            boot_time = psutil.boot_time()
-            current_time = time.time()
-            uptime_seconds = int(current_time - boot_time)
+            try:
+                boot_time = psutil.boot_time()
+                current_time = time.time()
+                uptime_seconds = int(current_time - boot_time)
+            except Exception as uptime_error:
+                app_logger.debug(f"Uptime-Berechnung fehlgeschlagen: {str(uptime_error)}")
+                uptime_seconds = 0
             
             stats['system'] = {
                 'cpu_percent': float(cpu_percent),