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/pkg/siteprobe/ssl_test.go

@@ -0,0 +1,37 @@
+package siteprobe
+
+import "testing"
+
+// SSL 地址解析单测 // Logan.Li
+func TestParseSSLTarget(t *testing.T) {
+	cases := []struct {
+		raw      string
+		host     string
+		port     string
+		wantFail bool
+	}{
+		{"example.com:443", "example.com", "443", false},
+		{"example.com", "example.com", "443", false},
+		{"https://example.com", "example.com", "443", false},
+		{"https://example.com:8443", "example.com", "8443", false},
+		{"https://example.com/path", "example.com", "443", false},
+		{"https:example.com", "example.com", "443", false},
+		{"ssl://example.com:443", "example.com", "443", false},
+		{"", "", "", true},
+	}
+	for _, c := range cases {
+		host, port, err := parseSSLTarget(c.raw)
+		if c.wantFail {
+			if err == nil {
+				t.Fatalf("expected error for %q", c.raw)
+			}
+			continue
+		}
+		if err != nil {
+			t.Fatalf("parseSSLTarget(%q): %v", c.raw, err)
+		}
+		if host != c.host || port != c.port {
+			t.Fatalf("parseSSLTarget(%q) = %s:%s, want %s:%s", c.raw, host, port, c.host, c.port)
+		}
+	}
+}