feat: 监控告警体系统一重构 + 自动化任务调度引擎 + 监控大屏拆分

告警中心
- 新增统一告警(alert_unified)、监控告警规则(monitor_alert_rule)、指标目录(alert_metric_catalog)
- 通知策略与消息分发(alert_notify_policy/dispatch/message)、静默规则
- 告警引擎按阈值/SNMP 拆分(alert_engine_monitor/snmp)

监控采集
- SNMP 常量/模板与历史指标(snmp templates/constants、snmp_metrics_history、snmp_collect)
- 中间件监控 Redis 采集与种子(middleware_monitor_redis/seed)
- 站点探测 pkg(siteprobe) + 站点视图(site_view)

自动化任务
- cron 调度器(cronscheduler)、脚本运行器(scriptrunner)、系统任务(systask)及运行记录(cron_job_run、system_task)

审计与凭证
- 审计设置(audit_setting) + 历史清理(auditcleaner)

前端
- 监控页面(host/middleware/site/snmp)拆分为子模块并大屏化
- 告警中心多 Tab(规则/指标目录/通知策略/静默)、任务管理组件重构、Agent CLI Markdown 渲染
- 移除旧脚本卡片/详情/日志组件，统一为 ScriptTable/ScriptCodeEditor/TerminalOutput

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

backend/controller/snmp.go

@@ -4,19 +4,22 @@ import (
 	"ezops/model"
 	"net/http"
 	"strconv"
+	"sync"
 
 	"github.com/gin-gonic/gin"
 	"gorm.io/gorm"
 )
 
-// SNMPHandler SNMP 设备管理 handler // Logan.Li
+// SNMPHandler SNMP 设备管理 + 采集 handler // Logan.Li
 type SNMPHandler struct {
-	db *gorm.DB
+	db     *gorm.DB
+	stopCh chan struct{}
+	wg     sync.WaitGroup
 }
 
 // NewSNMPHandler 创建 SNMP handler
 func NewSNMPHandler(db *gorm.DB) *SNMPHandler {
-	return &SNMPHandler{db: db}
+	return &SNMPHandler{db: db, stopCh: make(chan struct{})}
 }
 
 // ========== SNMP Device CRUD ==========
@@ -46,11 +49,42 @@ func (h *SNMPHandler) ListDevices(c *gin.Context) {
 // CreateDevice 创建 SNMP 设备
 // POST /api/v1/snmp/devices
 func (h *SNMPHandler) CreateDevice(c *gin.Context) {
-	var device model.SNMPDevice
-	if err := c.ShouldBindJSON(&device); err != nil {
+	var req struct {
+		Name         string `json:"name" binding:"required"`
+		IP           string `json:"ip" binding:"required"`
+		Port         int    `json:"port"`
+		SnmpVersion  string `json:"snmp_version"`
+		Version      string `json:"version"`
+		Community    string `json:"community"`
+		TemplateID   uint   `json:"template_id"`
+		DeviceType   string `json:"device_type"`
+		Vendor       string `json:"vendor"`
+		Description  string `json:"description"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
 		c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: err.Error()})
 		return
 	}
+	ver := req.SnmpVersion
+	if ver == "" {
+		ver = req.Version
+	}
+	if ver == "" {
+		ver = "v2c"
+	}
+	device := model.SNMPDevice{
+		Name: req.Name, IP: req.IP, Port: req.Port,
+		Version: model.SNMPVersion(ver), Community: req.Community,
+		TemplateID: req.TemplateID, DeviceType: req.DeviceType,
+		Vendor: req.Vendor, Description: req.Description,
+		Status: model.SNMPDeviceOffline,
+	}
+	if device.Port == 0 {
+		device.Port = 161
+	}
+	if device.Community == "" {
+		device.Community = "public"
+	}
 	if err := h.db.Create(&device).Error; err != nil {
 		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: err.Error()})
 		return
@@ -100,15 +134,17 @@ func (h *SNMPHandler) BatchDeleteDevices(c *gin.Context) {
 
 // ========== SNMP Template CRUD ==========
 
-// ListTemplates 列出 OID 模板
+// ListTemplates 列出 OID 模板（含 OID 条目）// Logan.Li
 // GET /api/v1/snmp/templates
 func (h *SNMPHandler) ListTemplates(c *gin.Context) {
 	var templates []model.SNMPTemplate
-	h.db.Order("name ASC").Find(&templates)
+	h.db.Preload("OIDs", func(db *gorm.DB) *gorm.DB {
+		return db.Order("sort_order ASC")
+	}).Order("name ASC").Find(&templates)
 	if templates == nil {
 		templates = []model.SNMPTemplate{}
 	}
-	c.JSON(http.StatusOK, model.Response{Code: 200, Data: templates})
+	c.JSON(http.StatusOK, model.Response{Code: 200, Data: gin.H{"list": templates, "total": len(templates)}})
 }
 
 // CreateTemplate 创建 OID 模板