feat(scheduler): 引入调度快照缓存与 outbox 回放

- 调度热路径优先读 Redis 快照，保留分组排序语义
- outbox 回放 + 全量重建纠偏，失败重试不推进水位
- 自动 Atlas 基线对齐并同步调度配置示例

backend/cmd/server/wire.go

@@ -67,6 +67,7 @@ func provideCleanup(
 	opsAlertEvaluator *service.OpsAlertEvaluatorService,
 	opsCleanup *service.OpsCleanupService,
 	opsScheduledReport *service.OpsScheduledReportService,
+	schedulerSnapshot *service.SchedulerSnapshotService,
 	tokenRefresh *service.TokenRefreshService,
 	accountExpiry *service.AccountExpiryService,
 	pricing *service.PricingService,
@@ -116,6 +117,12 @@ func provideCleanup(
 				}
 				return nil
 			}},
+			{"SchedulerSnapshotService", func() error {
+				if schedulerSnapshot != nil {
+					schedulerSnapshot.Stop()
+				}
+				return nil
+			}},
 			{"TokenRefreshService", func() error {
 				tokenRefresh.Stop()
 				return nil