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)

go.mod

@@ -0,0 +1,14 @@
+module github.com/user_TGPJp0KLpNsa5TAo/ddhv
+
+go 1.23.4
+
+require github.com/DemonZack/simplejrpc-go v0.0.0
+
+require (
+	github.com/sourcegraph/jsonrpc2 v0.2.1 // indirect
+	go.uber.org/multierr v1.10.0 // indirect
+	go.uber.org/zap v1.27.0 // indirect
+	gopkg.in/natefinch/lumberjack.v2 v2.2.1 // indirect
+)
+
+replace github.com/DemonZack/simplejrpc-go => /root/gmssh-src/gmssh-app-skeleton-go