feat: 跨平台命令助手 kopsc 初始实现

- 意图命令按 OS/架构、Linux 发行版与容器运行时解析并执行对应底层命令
- 内置 docker.clearsafe、net.ports、pkg.refreshindex
- --dry-run 预览、list/explain/platform/version 辅助命令
- 纯 Go 跨平台构建脚本 scripts/build

scripts/build/main_test.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"reflect"
+	"strings"
+	"testing"
+)
+
+func TestParseTargetsDefault(t *testing.T) {
+	got, err := parseTargets("")
+	if err != nil {
+		t.Fatalf("parseTargets(\"\") error: %v", err)
+	}
+	if !reflect.DeepEqual(got, defaultTargets) {
+		t.Fatalf("got %v, want default matrix %v", got, defaultTargets)
+	}
+}
+
+func TestParseTargetsCustom(t *testing.T) {
+	got, err := parseTargets(" linux/amd64 , windows/arm64 ,linux/amd64,")
+	if err != nil {
+		t.Fatalf("parseTargets error: %v", err)
+	}
+	want := []target{{"linux", "amd64"}, {"windows", "arm64"}}
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("got %v, want %v", got, want)
+	}
+}
+
+func TestParseTargetsInvalid(t *testing.T) {
+	for _, spec := range []string{"linux", "/amd64", "linux/", " , "} {
+		if _, err := parseTargets(spec); err == nil {
+			t.Errorf("parseTargets(%q) should fail", spec)
+		}
+	}
+}
+
+func TestArtifactName(t *testing.T) {
+	cases := []struct {
+		version string
+		t       target
+		want    string
+	}{
+		{"1.2.3", target{"linux", "amd64"}, "kopsc-1.2.3-linux-amd64"},
+		{"v1.2.3-2-gabc-dirty", target{"darwin", "arm64"}, "kopsc-v1.2.3-2-gabc-dirty-darwin-arm64"},
+		{"dev", target{"windows", "amd64"}, "kopsc-dev-windows-amd64.exe"},
+	}
+	for _, tc := range cases {
+		if got := artifactName(tc.version, tc.t); got != tc.want {
+			t.Errorf("artifactName(%q, %v) = %q, want %q", tc.version, tc.t, got, tc.want)
+		}
+	}
+}
+
+func TestRunRejectsConflictingFlags(t *testing.T) {
+	err := run([]string{"-host", "-targets", "linux/amd64"})
+	if err == nil || !strings.Contains(err.Error(), "cannot be used together") {
+		t.Fatalf("err = %v, want conflict error", err)
+	}
+}