LazyRun v1.0.0: shortcut maker untuk executable dan PWA

- Fungsi A: shortcut dari file executable (ELF/AppImage/script)
- Fungsi B: shortcut PWA/URL dengan deteksi browser (native, /opt, Flatpak)
- Checkbox Menu Aplikasi / Desktop, desktop-only pakai NoDisplay=true
- List + uninstall + deteksi shortcut yang file .desktop-nya hilang
- Metadata ~/.config/lazyrun/shortcuts.json, refresh cache XDG/KDE
- AppImage + zsync update info via build.sh

internal/shortcut/install.go

@@ -0,0 +1,105 @@
+package shortcut
+
+import (
+	"bytes"
+	"errors"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"lazyrun/internal/xdg"
+)
+
+func validate(name string, menu, desktop bool) error {
+	if name == "" {
+		return errors.New("name is required")
+	}
+	if strings.ContainsAny(name, "\n\r") {
+		return errors.New("name must not contain line breaks")
+	}
+	if !menu && !desktop {
+		return errors.New("pick at least one location (menu or desktop)")
+	}
+	if slugify(name) == "" {
+		return errors.New("name must contain at least one letter or digit")
+	}
+	return nil
+}
+
+// checkRunnable memastikan file adalah ELF (binary/AppImage) atau script dengan shebang.
+func checkRunnable(path string) error {
+	f, err := os.Open(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	st, err := f.Stat()
+	if err != nil {
+		return err
+	}
+	if st.IsDir() {
+		return errors.New("this is a directory, not a file")
+	}
+
+	head := make([]byte, 4)
+	n, _ := io.ReadFull(f, head)
+	head = head[:n]
+	if bytes.HasPrefix(head, []byte{0x7f, 'E', 'L', 'F'}) || bytes.HasPrefix(head, []byte("#!")) {
+		return nil
+	}
+	return errors.New("not an executable binary (ELF, AppImage, or script only)")
+}
+
+// copyFile menyalin src ke dst lewat file sementara supaya dst tidak pernah setengah tertulis.
+func copyFile(src, dst string, mode os.FileMode) error {
+	in, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+
+	if err := os.MkdirAll(filepath.Dir(dst), 0o755); err != nil {
+		return err
+	}
+	tmp, err := os.CreateTemp(filepath.Dir(dst), ".lazyrun-*")
+	if err != nil {
+		return err
+	}
+	defer os.Remove(tmp.Name())
+
+	if _, err := io.Copy(tmp, in); err != nil {
+		tmp.Close()
+		return err
+	}
+	if err := tmp.Chmod(mode); err != nil {
+		tmp.Close()
+		return err
+	}
+	if err := tmp.Close(); err != nil {
+		return err
+	}
+	return os.Rename(tmp.Name(), dst)
+}
+
+func samePath(a, b string) bool {
+	sa, err := os.Stat(a)
+	if err != nil {
+		return false
+	}
+	sb, err := os.Stat(b)
+	if err != nil {
+		return false
+	}
+	return os.SameFile(sa, sb)
+}
+
+// desktopCopy menyalin .desktop ke ~/Desktop agar bisa diklik ganda.
+func desktopCopy(desktopPath, slug string) (string, error) {
+	dst := filepath.Join(xdg.DesktopDir(), slug+".desktop")
+	if _, err := os.Stat(dst); err == nil && !samePath(dst, desktopPath) {
+		return "", errors.New(dst + " already exists")
+	}
+	return dst, copyFile(desktopPath, dst, 0o755)
+}