fix(alerts): Pro 到期后告警引擎停止评估 + 规则/通道写操作挂 RequirePro

用户指出的漏洞:免费期配完规则,到期后若引擎继续跑,告警等于免费功能,Pro 形同虚设;
重装又拿新试用继续白用。修复:
- 引擎每轮先查 IsPro(),非 Pro 整轮跳过(规则与投递历史保留,重新授权即恢复)
- 规则建/改、通道保存、立即检查挂 RequirePro 闸门(读列表/历史保持可见,升级引导有据可依)
- 试用期内 IsPro=true 照常工作(实测建规则 200)

backend/routers/router.go

@@ -143,14 +143,14 @@ func SetupRouter() *gin.Engine {
 		alertNotify.PUT("/notify-config", middleware.AdminAuth(), alertsCtrl.UpdateNotifyConfig)
 		alertNotify.POST("/notify-config/test", middleware.AdminAuth(), alertsCtrl.TestNotifyConfig)
 		alertNotify.GET("/rules", alertsCtrl.ListRules)
-		alertNotify.POST("/rules", middleware.AdminAuth(), alertsCtrl.CreateRule)
-		alertNotify.PUT("/rules/:id", middleware.AdminAuth(), alertsCtrl.UpdateRule)
+		alertNotify.POST("/rules", middleware.AdminAuth(), middleware.RequirePro(), alertsCtrl.CreateRule)
+		alertNotify.PUT("/rules/:id", middleware.AdminAuth(), middleware.RequirePro(), alertsCtrl.UpdateRule)
 		alertNotify.DELETE("/rules/:id", middleware.AdminAuth(), alertsCtrl.DeleteRule)
-		alertNotify.POST("/check", middleware.AdminAuth(), alertsCtrl.CheckNow)
+		alertNotify.POST("/check", middleware.AdminAuth(), middleware.RequirePro(), alertsCtrl.CheckNow)
 		alertNotify.GET("/deliveries", alertsCtrl.Deliveries)
 		alertNotify.GET("/channels", alertsCtrl.ListChannels)
-		alertNotify.POST("/channels", middleware.AdminAuth(), alertsCtrl.SaveChannel)
-		alertNotify.PUT("/channels/:id", middleware.AdminAuth(), alertsCtrl.SaveChannel)
+		alertNotify.POST("/channels", middleware.AdminAuth(), middleware.RequirePro(), alertsCtrl.SaveChannel)
+		alertNotify.PUT("/channels/:id", middleware.AdminAuth(), middleware.RequirePro(), alertsCtrl.SaveChannel)
 		alertNotify.DELETE("/channels/:id", middleware.AdminAuth(), alertsCtrl.DeleteChannel)
 		alertNotify.POST("/channels/test", middleware.AdminAuth(), alertsCtrl.TestChannel)
 	}

backend/services/alert.go

@@ -84,6 +84,12 @@ func StartAlertEngine() {
 				log.Printf("[alert] 上一轮检查仍在运行，跳过本轮")
 				continue
 			}
+			// Pro 闸门:日志告警是 Pro 功能,免费/试用到期后引擎不再评估
+			// (规则与历史保留,重新授权即恢复,不删任何数据)
+			if !IsPro() {
+				alertCheckRunning.Store(false)
+				continue
+			}
 			start := time.Now()
 			ok := true
 			func() {