Add NSIS_HOOK_PREINSTALL macro that stops WireGuardTunnel$NexaVPN service, kills nexavpn-desktop.exe and nexavpn-tunnel-helper.exe processes, and stops NexaVPNTunnelService before installation. Add WireGuardTunnel$NexaVPN service stop to NSIS_HOOK_PREUNINSTALL before service uninstallation.
Change NSIS installer hooks to use bundled/ instead of resources/bundled/ path for tunnel helper executable. Add waitForTunnelStatus helper that polls tunnel status up to 8 times with 500ms intervals to verify expected state after connect/disconnect operations. Update toggle handler to use polling instead of single status check and add error message for failed disconnect operations.
Add Windows service to handle WireGuard tunnel operations with elevated privileges. Implement IPC server on TCP port 53189 for client-service communication using JSON protocol. Add install-service and uninstall-service commands to NSIS installer hooks for automatic service installation. Replace direct WireGuard calls with IPC requests when running on Windows. Add TunnelRequest and TunnelResponse types for IPC protocol
