feat(service): 增强ops业务逻辑和告警功能

- 实现告警静默功能的业务逻辑
- 优化错误分类和重试机制
- 扩展告警评估和通知功能
- 完善错误解决和重试结果处理

backend/internal/service/ops_alert_evaluator_service.go

@@ -236,6 +236,17 @@ func (s *OpsAlertEvaluatorService) evaluateOnce(interval time.Duration) {
 				continue
 			}
 
+			// Scoped silencing: if a matching silence exists, skip creating a firing event.
+			if s.opsService != nil {
+				platform := strings.TrimSpace(scopePlatform)
+				region := (*string)(nil)
+				if platform != "" {
+					if ok, err := s.opsService.IsAlertSilenced(ctx, rule.ID, platform, scopeGroupID, region, now); err == nil && ok {
+						continue
+					}
+				}
+			}
+
 			latestEvent, err := s.opsRepo.GetLatestAlertEvent(ctx, rule.ID)
 			if err != nil {
 				log.Printf("[OpsAlertEvaluator] get latest event failed (rule=%d): %v", rule.ID, err)