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_cli.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"vpn-client/internal/cli"
+	"vpn-client/internal/config"
+)
+
+func main() {
+	// Инициализация конфигурации
+	if err := config.Init(); err != nil {
+		fmt.Fprintf(os.Stderr, "Ошибка инициализации: %v\n", err)
+		os.Exit(1)
+	}
+
+	// Запуск CLI
+	if err := cli.Run(); err != nil {
+		fmt.Fprintf(os.Stderr, "Ошибка: %v\n", err)
+		os.Exit(1)
+	}
+}