feat: LokiDeploy 初始提交 - 轻量级 K8s Loki 部署平台

Go(Gin) + React(Vite + shadcn/ui + Tailwind) 前后端分离，全中文 UI

- 集群管理：Kubeconfig / Token 双接入，kubectl + helm 部署
- 主机管理：SSH 密钥 / 密码双认证，CPU/内存/磁盘使用率监控，SSH 错误中文友好提示
- 存储配置、部署管理、系统设置
- Docker 镜像内置 kubectl + helm，开箱即用
- run.sh 一键启停（start/stop/restart/status）

Co-Authored-By: Claude <noreply@anthropic.com>

backend/services/ssh_errors.go

@@ -0,0 +1,33 @@
+package services
+
+import "strings"
+
+// FormatSSHError 将底层 SSH 错误翻译为中文友好提示，便于用户排查
+func FormatSSHError(err error) string {
+	if err == nil {
+		return ""
+	}
+	msg := err.Error()
+	lower := strings.ToLower(msg)
+
+	switch {
+	case strings.Contains(lower, "i/o timeout") ||
+		strings.Contains(lower, "deadline exceeded") ||
+		strings.Contains(lower, "connection timed out"):
+		return "连接超时，请检查主机网络或 SSH 端口是否可达"
+	case strings.Contains(lower, "connection refused"):
+		return "连接被拒绝，目标端口未开放或 SSH 服务未运行"
+	case strings.Contains(lower, "no such host") ||
+		strings.Contains(lower, "no route to host"):
+		return "无法解析或到达目标主机，请检查 IP 地址"
+	case strings.Contains(lower, "permission denied") ||
+		strings.Contains(lower, "unable to authenticate") ||
+		strings.Contains(lower, "handshake") ||
+		strings.Contains(lower, "password"):
+		return "认证失败，请检查用户名、密码或 SSH 密钥"
+	case strings.Contains(lower, "no supported methods"):
+		return "SSH 协商失败，服务端未支持当前认证方式"
+	default:
+		return msg
+	}
+}