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/cache.go

@@ -0,0 +1,26 @@
+package shortcut
+
+import (
+	"context"
+	"os/exec"
+	"time"
+
+	"lazyrun/internal/xdg"
+)
+
+// RefreshCache memberi tahu desktop environment supaya .desktop baru langsung terbaca.
+// Best-effort: kalau tool tidak ada atau gagal, menu tetap refresh saat login berikutnya.
+func RefreshCache() {
+	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
+	defer cancel()
+
+	if p, err := exec.LookPath("update-desktop-database"); err == nil {
+		_ = exec.CommandContext(ctx, p, xdg.ApplicationsDir()).Run()
+	}
+	for _, tool := range []string{"kbuildsycoca6", "kbuildsycoca5"} {
+		if p, err := exec.LookPath(tool); err == nil {
+			_ = exec.CommandContext(ctx, p, "--noincremental").Run()
+			return
+		}
+	}
+}