Scheduled posts: written now, published at their time

POST /api/v1/statuses with scheduled_at no longer posts at once: the post is
kept as asked (at least five minutes ahead; 300 waiting, 25 a day, as
Mastodon allows), its media kept from the janitor, and a PublishScheduled job
publishes it at its time as the persona. scheduled_statuses lists, moves and
drops them; a moved post's old job finds it not due. Idempotency-Key holds
for scheduling too.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

PrivaPub/Middleware/SocialPubConfigurations.cs

@@ -105,6 +105,7 @@ namespace PrivaPub.Middleware
 				.AddSingleton<IJobHandler, RecoveryJob>()
 				.AddSingleton<IJobHandler, Federation.Actors.AccountCountsJob>()
 				.AddSingleton<IJobHandler, PollCloseJob>()
+				.AddSingleton<IJobHandler, Domain.Statuses.PublishScheduledJob>()
 				.AddSingleton<InstanceDescriber>()
 				.AddSingleton<IJobHandler>(services => services.GetRequiredService<InstanceDescriber>())
 				.AddSingleton<IJobHandler, AncestorsJobHandler>()