feat(gui): add GUI (Test) implementation with documentation and admin support

- Add GUI (Test) module with Fyne-based interface (internal/gui/gui.go, internal/gui/server.go)
- Add CLI monitoring capability (internal/cli/monitor.go)
- Add main_cli.go entry point for CLI-only builds
- Add comprehensive documentation suite covering setup, build, quick start, and changelog
- Add admin manifest (admin.manifest) for Windows UAC elevation support
- Add rsrc.syso.json configuration for resource embedding
- Update .gitignore to exclude build scripts (*.bat, *.sh)
- Update main.go and cli.go to support dual GUI (Test)/CLI modes
- Update README.md with new project information
- Enables users to build and run both GUI (Test)and CLI versions with proper admin privileges on Windows

main.go

@@ -6,6 +6,7 @@ import (
 
 	"vpn-client/internal/cli"
 	"vpn-client/internal/config"
+	"vpn-client/internal/gui"
 )
 
 func main() {
@@ -15,9 +16,18 @@ func main() {
 		os.Exit(1)
 	}
 
-	// Запуск CLI
-	if err := cli.Run(); err != nil {
-		fmt.Fprintf(os.Stderr, "Ошибка: %v\n", err)
-		os.Exit(1)
+	// Проверяем аргументы командной строки
+	if len(os.Args) > 1 && os.Args[1] == "--cli" {
+		// Запуск CLI режима
+		if err := cli.Run(); err != nil {
+			fmt.Fprintf(os.Stderr, "Ошибка: %v\n", err)
+			os.Exit(1)
+		}
+	} else {
+		// Запуск GUI режима (по умолчанию)
+		if err := gui.Run(); err != nil {
+			fmt.Fprintf(os.Stderr, "Ошибка: %v\n", err)
+			os.Exit(1)
+		}
 	}
 }