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

cmd/kopsc/main.go

@@ -0,0 +1,18 @@
+// Command kopsc is a cross-platform command assistant: one intent, one
+// platform-appropriate command.
+package main
+
+import (
+	"os"
+
+	"gitea.odboy.cn/odboy/kenaito-kopsc/internal/cli"
+)
+
+// version can be overridden at build time:
+//
+//	go build -ldflags "-X main.version=1.2.3" -o bin/kopsc ./cmd/kopsc
+var version = "dev"
+
+func main() {
+	os.Exit(cli.New(version).Execute(os.Args[1:]))
+}