feat: 服务器批量导入全栈实现 + SQL审计模型修复 + 审批流程增强

服务器批量导入:
- 后端 BatchCreateServers handler: 逐条校验/查重/GB→MB转换/错误明细
- 前端 CSV 解析器 + IP校验 + 模板下载 + 真实API导入
- 删除孤立占位组件 BatchImport.tsx

SQL审计:
- 修复 TableName 字段与 GORM 接口冲突 → TargetTable
- 补全路由注册 + AutoMigrate + 种子数据

审批流程增强 + 告警/菜单微调

// Logan.Li

backend/internal/api/handlers/server.go

@@ -1,8 +1,10 @@
 package handlers
 
 import (
+	"fmt"
 	"net/http"
 	"strconv"
+	"strings"
 
 	"ezops/internal/models"
 
@@ -177,6 +179,80 @@ func (h *ServerHandler) CreateServer(c *gin.Context) {
 	})
 }
 
+// BatchCreateServers 批量导入服务器 // Logan.Li
+// 接收 {servers:[...], region_id, auth_type}，逐条校验并创建，跳过重复（主机名或IP已存在）
+func (h *ServerHandler) BatchCreateServers(c *gin.Context) {
+	var req models.BatchCreateServerRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, models.Response{
+			Code:    400,
+			Message: "请求参数错误: " + err.Error(),
+		})
+		return
+	}
+
+	authType := strings.TrimSpace(req.AuthType)
+	if authType == "" {
+		authType = "password"
+	}
+
+	result := models.BatchCreateResult{Errors: []string{}}
+	for i, item := range req.Servers {
+		hostname := strings.TrimSpace(item.Hostname)
+		ip := strings.TrimSpace(item.IP)
+		if hostname == "" || ip == "" {
+			result.Failed++
+			result.Errors = append(result.Errors, fmt.Sprintf("第%d行: 主机名和IP不能为空", i+2))
+			continue
+		}
+
+		// 重复检查（主机名或 IP 已存在则跳过）
+		var count int64
+		h.db.Model(&models.Server{}).Where("hostname = ? OR ip = ?", hostname, ip).Count(&count)
+		if count > 0 {
+			result.Skipped++
+			continue
+		}
+
+		port := item.Port
+		if port == 0 {
+			port = 22
+		}
+		username := strings.TrimSpace(item.Username)
+		if username == "" {
+			username = "root"
+		}
+
+		server := models.Server{
+			Hostname: hostname,
+			IP:       ip,
+			Port:     port,
+			Username: username,
+			AuthType: authType,
+			OS:       item.OS,
+			CPU:      item.CPU,
+			Memory:   item.Memory * 1024, // GB → MB
+			Disk:     item.Disk,
+			Tags:     item.Tags,
+			RegionID: req.RegionID,
+			Status:   "stopped",
+		}
+		if err := h.db.Create(&server).Error; err != nil {
+			result.Failed++
+			result.Errors = append(result.Errors, fmt.Sprintf("%s(%s): %s", hostname, ip, err.Error()))
+			continue
+		}
+		result.Success++
+	}
+
+	msg := fmt.Sprintf("导入完成: 成功 %d, 跳过 %d, 失败 %d", result.Success, result.Skipped, result.Failed)
+	c.JSON(http.StatusOK, models.Response{
+		Code:    200,
+		Message: msg,
+		Data:    result,
+	})
+}
+
 // UpdateServer 更新服务器
 // @Summary 更新服务器
 // @Description 更新指定服务器信息