feat(cli): add settings menu and VLESS log viewer with core selection

- Add settings menu to switch between Xray and V2Ray cores for VLESS connections
- Implement core type persistence in configuration with LoadSettings/SaveSettings
- Add VLESS error and access log viewer showing last 30 and 20 lines respectively
- Display current core type and system time in main menu
- Update VLESS connection to use selected core dynamically
- Refactor monitor.go to accept 'q' key input for graceful exit instead of signal handling
- Add proxy platform-specific implementations (proxy_unix.go, proxy_windows.go)
- Add downloader module for managing binary resources
- Include V2Ray and Xray configuration files and geodata (geoip.dat, geosite.dat)
- Update CLI imports to include path/filepath and time packages
- Improve user experience with core selection visibility and log diagnostics

internal/vpn/vpn.go

@@ -9,6 +9,7 @@ import (
 
 	"vpn-client/internal/config"
 	"vpn-client/internal/logger"
+	"vpn-client/internal/proxy"
 	"vpn-client/internal/wireguard"
 )
 
@@ -84,6 +85,16 @@ func Disconnect(logsDir string) error {
 		return fmt.Errorf("ошибка сохранения состояния: %w", err)
 	}
 
+	// Отключаем системный прокси если был VLESS
+	if state.ConfigType == "vless" {
+		if err := proxy.DisableSystemProxy(); err != nil {
+			fmt.Printf("%s Не удалось отключить системный прокси: %v\n", "⚠", err)
+			fmt.Println("Отключите его вручную в настройках Windows")
+		} else {
+			fmt.Println("✓ Системный прокси отключен")
+		}
+	}
+
 	fmt.Println("✓ Отключено от VPN")
 	return nil
 }