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/middleware_monitor_redis.go

@@ -0,0 +1,101 @@
+package controller
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/redis/go-redis/v9"
+)
+
+// collectRedis 采集 Redis 指标，支持单机与集群模式 // Logan.Li
+func (h *MiddlewareMonitorHandler) collectRedis(ctx context.Context, addr, password, mode string) (map[string]float64, error) {
+	if mode == "" {
+		mode = "standalone"
+	}
+
+	var (
+		info        string
+		dbSize      int64
+		clusterInfo string
+		pingErr     error
+	)
+
+	switch mode {
+	case "cluster":
+		rdb := redis.NewClusterClient(&redis.ClusterOptions{
+			Addrs:    []string{addr},
+			Password: password,
+		})
+		defer rdb.Close()
+
+		pingErr = rdb.Ping(ctx).Err()
+		if pingErr == nil {
+			info, _ = rdb.Info(ctx).Result()
+			dbSize, _ = rdb.DBSize(ctx).Result()
+			clusterInfo, _ = rdb.ClusterInfo(ctx).Result()
+		}
+	default:
+		rdb := redis.NewClient(&redis.Options{
+			Addr:     addr,
+			Password: password,
+			DB:       0,
+		})
+		defer rdb.Close()
+
+		pingErr = rdb.Ping(ctx).Err()
+		if pingErr == nil {
+			info, _ = rdb.Info(ctx).Result()
+			dbSize, _ = rdb.DBSize(ctx).Result()
+		}
+	}
+
+	if pingErr != nil {
+		return nil, fmt.Errorf("Redis 连接失败: %v", pingErr)
+	}
+
+	return buildRedisMetrics(info, dbSize, clusterInfo, mode), nil
+}
+
+// buildRedisMetrics 从 INFO 与 DBSIZE 构建指标 map // Logan.Li
+func buildRedisMetrics(info string, dbSize int64, clusterInfo, mode string) map[string]float64 {
+	result := make(map[string]float64)
+
+	if info != "" {
+		infoMap := parseRedisInfo(info)
+		result["redis_connected_clients"] = parseFloat(infoMap["connected_clients"])
+		result["redis_used_memory"] = parseFloat(infoMap["used_memory"])
+		result["redis_used_memory_peak"] = parseFloat(infoMap["used_memory_peak"])
+		result["redis_total_commands_processed"] = parseFloat(infoMap["total_commands_processed"])
+		result["redis_uptime_in_seconds"] = parseFloat(infoMap["uptime_in_seconds"])
+		result["redis_keyspace_hits"] = parseFloat(infoMap["keyspace_hits"])
+		result["redis_keyspace_misses"] = parseFloat(infoMap["keyspace_misses"])
+		result["redis_evicted_keys"] = parseFloat(infoMap["evicted_keys"])
+		result["redis_blocked_clients"] = parseFloat(infoMap["blocked_clients"])
+		result["redis_maxmemory"] = parseFloat(infoMap["maxmemory"])
+		result["redis_mem_fragmentation_ratio"] = parseFloat(infoMap["mem_fragmentation_ratio"])
+
+		hits := result["redis_keyspace_hits"]
+		misses := result["redis_keyspace_misses"]
+		if hits+misses > 0 {
+			result["redis_hit_rate"] = hits / (hits + misses)
+		}
+
+		uptime := result["redis_uptime_in_seconds"]
+		cmds := result["redis_total_commands_processed"]
+		if uptime > 0 {
+			result["redis_qps"] = cmds / uptime
+		}
+	}
+
+	if dbSize >= 0 {
+		result["redis_db_size"] = float64(dbSize)
+	}
+
+	if mode == "cluster" && clusterInfo != "" {
+		ci := parseRedisInfo(clusterInfo)
+		result["redis_cluster_known_nodes"] = parseFloat(ci["cluster_known_nodes"])
+		result["redis_cluster_size"] = parseFloat(ci["cluster_size"])
+	}
+
+	return result
+}