feat: 系统调优 Go 版后端完整源码

- 19 个接口全部实测验收通过 (2026-08-08)
- 结构: main.go + core/consts + gsysctl + gtuner + server
- 含 build_go.sh 官方部署结构构建脚本 (amd64/arm64 交叉编译)
- 数据无缝衔接 Python 版遗留 (快照/state/审计日志)
- 备份自 156:/root/goddhv (2026-08-09)

core/consts/consts.go

@@ -0,0 +1,33 @@
+package consts
+
+import (
+	"os"
+	"path/filepath"
+)
+
+// 应用标识：{组织名}/{应用名}，与部署一致
+const APP_NAME = "user_TGPJp0KLpNsa5TAo/ddhv"
+
+// GMSSH 平台根路径
+const GMSSH_PATH = "/.__gmssh"
+
+// 部署相关路径
+var (
+	// APP_INSTALLED_PATH: 应用安装目录
+	APP_INSTALLED_PATH = filepath.Join(GMSSH_PATH, "plugin", APP_NAME)
+	// APP_TMP_PATH: 临时/socket 目录
+	APP_TMP_PATH = filepath.Join(APP_INSTALLED_PATH, "tmp")
+	// APP_BIN_PATH: 二进制目录
+	APP_BIN_PATH = filepath.Join(APP_INSTALLED_PATH, "app", "bin")
+	// APP_DATA_PATH: 数据目录(快照/状态/审计)
+	APP_DATA_PATH = filepath.Join(APP_INSTALLED_PATH, "data")
+	// APP_SOCKET_FILE_PATH: unix socket 文件
+	APP_SOCKET_FILE_PATH = filepath.Join(APP_TMP_PATH, "app.sock")
+)
+
+// 确保目录存在
+func EnsureDirs() {
+	for _, d := range []string{APP_TMP_PATH, APP_DATA_PATH} {
+		os.MkdirAll(d, 0o755)
+	}
+}