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/llm_chat.go

@@ -176,16 +176,67 @@ func writeSSEError(c *gin.Context, code int, message string) {
 	c.Writer.Flush()
 }
 
-// TestLLMConnection 测试 LLM 连接（询问模型身份并返回回答） // Logan.Li
+// llmConfigFromTestRequest 将测试请求转为运行时配置（脱敏 Key 回退已保存值） // Logan.Li
+func (h *LLMHandler) llmConfigFromTestRequest(req model.SaveLLMConfigRequest) (model.LLMConfig, string) {
+	cfg := model.LLMConfig{
+		Provider:         req.Provider,
+		Model:            req.Model,
+		APIKey:           req.APIKey,
+		Endpoint:         req.Endpoint,
+		Temperature:      req.Temperature,
+		MaxTokens:        req.MaxTokens,
+		ReasoningEnabled: req.ReasoningEnabled,
+	}
+	if cfg.Temperature == 0 {
+		cfg.Temperature = 0.7
+	}
+	if cfg.MaxTokens == 0 {
+		cfg.MaxTokens = 8192
+	}
+	if strings.Contains(req.APIKey, "****") {
+		var saved model.LLMConfig
+		if err := h.db.First(&saved).Error; err != nil {
+			if !isLocalLLMProvider(req.Provider) {
+				return cfg, "请填写 API Key"
+			}
+		} else {
+			cfg.APIKey = saved.APIKey
+		}
+	}
+	if cfg.Provider == "" {
+		return cfg, "请选择提供商"
+	}
+	if cfg.Model == "" {
+		return cfg, "请填写模型名"
+	}
+	if cfg.APIKey == "" && !isLocalLLMProvider(cfg.Provider) {
+		return cfg, "请填写 API Key"
+	}
+	return cfg, ""
+}
+
+// TestLLMConnection 测试 LLM 连接（支持草稿配置，保存前即可验证） // Logan.Li
 // POST /api/v1/aiops/llm-config/test
 func (h *LLMHandler) TestLLMConnection(c *gin.Context) {
+	var req model.SaveLLMConfigRequest
+	_ = c.ShouldBindJSON(&req) // 空 body 时回退已保存配置 // Logan.Li
+
 	var cfg model.LLMConfig
-	if err := h.db.First(&cfg).Error; err != nil {
-		c.JSON(http.StatusOK, model.Response{Code: 400, Message: "请先保存配置"})
-		return
+	var errMsg string
+	if req.Provider != "" {
+		cfg, errMsg = h.llmConfigFromTestRequest(req)
+	} else {
+		if err := h.db.First(&cfg).Error; err != nil {
+			c.JSON(http.StatusOK, model.Response{Code: 400, Message: "请先填写配置并测试连接"})
+			return
+		}
+		if cfg.APIKey == "" && !isLocalLLMProvider(cfg.Provider) {
+			c.JSON(http.StatusOK, model.Response{Code: 400, Message: "请填写 API Key"})
+			return
+		}
 	}
-	if !cfg.Enabled {
-		c.JSON(http.StatusOK, model.Response{Code: 400, Message: "请先启用 LLM 服务"})
+	if errMsg != "" {
+		c.JSON(http.StatusOK, model.Response{Code: 400, Message: errMsg})
 		return
 	}
 	resp, err := buildLLMClientFromConfig(cfg).Complete(c.Request.Context(), &llm.CompletionRequest{
@@ -196,10 +247,10 @@ func (h *LLMHandler) TestLLMConnection(c *gin.Context) {
 		return
 	}
 	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "连接成功", Data: gin.H{
-		"answer":        resp.Message.Content,
-		"model":         resp.Model,
-		"tokens_used":   resp.Usage.TotalTokens,
-		"provider":      cfg.Provider,
+		"answer":            resp.Message.Content,
+		"model":             resp.Model,
+		"tokens_used":       resp.Usage.TotalTokens,
+		"provider":          cfg.Provider,
 		"reasoning_enabled": cfg.ReasoningEnabled,
 	}})
 }