feat: 新增 proc.list/user.list/pkg.list 命令

proc.list 列出所有进程（ps aux/tasklist）
user.list 列出系统用户（getent passwd/net user）
pkg.list 列出已安装软件包（dpkg/rpm/apk/brew/winget）

internal/executor/pkglist.go

@@ -0,0 +1,77 @@
+package executor
+
+import (
+	"context"
+	"fmt"
+	"os/exec"
+	"runtime"
+	"strings"
+
+	"gitea.odboy.cn/odboy/kenaito-kopsc/internal/platform"
+)
+
+// runPkgList implements `kopsc pkg list`: list installed packages.
+func runPkgList(ctx context.Context, req BuiltinRequest) error {
+	switch runtime.GOOS {
+	case "linux":
+		return pkgListLinux(ctx, req)
+	case "darwin":
+		cmd := exec.CommandContext(ctx, "brew", "list")
+		cmd.Stdout = req.Stdout
+		cmd.Stderr = req.Stderr
+		return cmd.Run()
+	case "windows":
+		cmd := exec.CommandContext(ctx, "winget", "list")
+		cmd.Stdout = req.Stdout
+		cmd.Stderr = req.Stderr
+		return cmd.Run()
+	default:
+		return fmt.Errorf("不支持的操作系统: %s", runtime.GOOS)
+	}
+}
+
+func pkgListLinux(ctx context.Context, req BuiltinRequest) error {
+	info := platform.System().Detect()
+
+	// Debian/Ubuntu: dpkg -l
+	if distroLikeContains(info, "debian", "ubuntu") {
+		cmd := exec.CommandContext(ctx, "dpkg", "-l")
+		cmd.Stdout = req.Stdout
+		cmd.Stderr = req.Stderr
+		return cmd.Run()
+	}
+
+	// CentOS/RHEL/Fedora: rpm -qa
+	if distroLikeContains(info, "rhel", "fedora") || info.Distro == "centos" {
+		cmd := exec.CommandContext(ctx, "rpm", "-qa", "--qf", "%{NAME}-%{VERSION}-%{RELEASE}.%{ARCH}\n")
+		cmd.Stdout = req.Stdout
+		cmd.Stderr = req.Stderr
+		return cmd.Run()
+	}
+
+	// Alpine: apk list --installed
+	if info.Distro == "alpine" {
+		cmd := exec.CommandContext(ctx, "apk", "list", "--installed")
+		cmd.Stdout = req.Stdout
+		cmd.Stderr = req.Stderr
+		return cmd.Run()
+	}
+
+	return fmt.Errorf("不支持的 Linux 发行版: %s", info.Distro)
+}
+
+func distroLikeContains(info platform.Info, values ...string) bool {
+	all := make([]string, 0, 1+len(info.DistroLike))
+	if info.Distro != "" {
+		all = append(all, info.Distro)
+	}
+	all = append(all, info.DistroLike...)
+	for _, a := range all {
+		for _, v := range values {
+			if strings.EqualFold(a, v) {
+				return true
+			}
+		}
+	}
+	return false
+}