fix(generation): repair articles stuck in generating when latest task is terminal

The state-consistency worker now detects articles still flagged as
generating whose latest generation_task is already failed or completed
(with a version) and aligns the article status to the terminal task,
invalidating article caches on the way out. Adds supporting partial
indexes and switches UpdateGenerationTaskStatus to COALESCE started_at
and completed_at so partial status updates don't wipe the timestamps.

server/cmd/scheduler/main.go

@@ -93,7 +93,8 @@ func main() {
 	monitoringReceivedInspectionWorker := internalscheduler.NewMonitoringReceivedInspectionWorker(app.MonitoringDB, app.Logger)
 	knowledgeDeletedCleanupWorker := internalscheduler.NewKnowledgeDeletedCleanupWorker(knowledgeSvc)
 	generationStateCheckWorker := generateworker.NewGenerationTaskStateCheckWorker(app.DB, app.Logger, app.Config().Generation).
-		WithConfigProvider(app.ConfigStore)
+		WithConfigProvider(app.ConfigStore).
+		WithCache(app.Cache)
 
 	startSchedulerWorker(ctx, &workerWG, "schedule_dispatch", app.Logger.Sugar(), scheduleDispatchWorker.Run)
 	startSchedulerWorker(ctx, &workerWG, "monitoring_daily_task", app.Logger.Sugar(), monitoringDailyTaskWorker.Run)