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>

frontend/src/components/deploy/CredentialManager.tsx

@@ -1,4 +1,5 @@
 import { useState } from 'react';
+import { cn } from '@/lib/utils';
 import { useTranslation } from 'react-i18next';
 import {
   Plus, Pencil, Trash2, RefreshCw, Key, Shield, Search,
@@ -39,7 +40,7 @@ export default function CredentialManager() {
     ...(filterType && filterType !== 'all' ? { secret_type: filterType } : {}),
   };
 
-  const { data: credentials = [], isLoading: loading, refetch } = useCredentials(listParams);
+  const { data: credentials = [], isLoading: loading, isFetching, refetch } = useCredentials(listParams);
   const { deleteMutation, toggleActiveMutation } = useCredentialMutations();
 
   const handleDelete = async (cred: Credential) => {
@@ -118,8 +119,8 @@ export default function CredentialManager() {
       toolbar={toolbar}
       actions={(
         <>
-          <Button variant="outline" size="sm" className="dg-btn-secondary" onClick={() => refetch()}>
-            <RefreshCw className="w-4 h-4 mr-1" />{t('common.refresh')}
+          <Button variant="outline" size="sm" className="dg-btn-secondary" onClick={() => refetch()} disabled={isFetching}>
+            <RefreshCw className={cn('w-4 h-4 mr-1', isFetching && 'animate-spin')} />{t('common.refresh')}
           </Button>
           <Button size="sm" className="dg-btn-primary" onClick={() => { setEditing(null); setDialogOpen(true); }}>
             <Plus className="w-4 h-4 mr-1" />{t('deploy.cred.addCredential')}

frontend/src/components/deploy/PipelineManager.tsx

@@ -33,7 +33,7 @@ import { StatStrip } from '@/components/ui/stat-strip';
 export function PipelineManager() {
   const { t } = useTranslation();
   const [searchQuery, setSearchQuery] = useState('');
-  const { data: pipelines = [], isLoading: loading, refetch: refetchPipelines } = usePipelines();
+  const { data: pipelines = [], isLoading: loading, isFetching, refetch: refetchPipelines } = usePipelines();
   const { triggerMutation, deleteMutation, stopRunMutation } = usePipelineMutations();
   const [expanded, setExpanded] = useState<Record<number, boolean>>({});
   const [runs, setRuns] = useState<Record<number, Record<string, unknown>[]>>({});
@@ -210,8 +210,8 @@ export function PipelineManager() {
       toolbar={toolbar}
       actions={(
         <>
-          <Button variant="outline" className="dg-btn-secondary" onClick={() => refetchPipelines()}>
-            <Clock className={`h-4 w-4 mr-2 ${loading ? 'animate-spin' : ''}`} />{t('common.refresh')}
+          <Button variant="outline" className="dg-btn-secondary" onClick={() => refetchPipelines()} disabled={isFetching}>
+            <Clock className={`h-4 w-4 mr-2 ${isFetching ? 'animate-spin' : ''}`} />{t('common.refresh')}
           </Button>
           <Button className="dg-btn-primary" onClick={() => setNewOpen(true)}>
             <Plus className="h-4 w-4 mr-2" />{t('deploy.pipeline.newPipeline')}