feat: suspend instance improvements (#13861)

* feat(backend): dead instance detection

* feat(backend): suspend type detection

* feat(frontend): show suspend reason on frontend

* feat(backend): resume federation automatically if the server is automatically suspended

* docs(changelog): 配信停止まわりの改善

* lint: fix lint errors

* Update packages/frontend/src/pages/instance-info.vue

* lint: fix lint error

* chore: suspendedState => suspensionState

---------

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

packages/backend/src/queue/processors/InboxProcessorService.ts

@@ -188,6 +188,8 @@ export class InboxProcessorService {
 			this.federatedInstanceService.update(i.id, {
 				latestRequestReceivedAt: new Date(),
 				isNotResponding: false,
+				// もしサーバーが死んでるために配信が止まっていた場合には自動的に復活させてあげる
+				suspensionState: i.suspensionState === 'autoSuspendedForNotResponding' ? 'none' : undefined,
 			});
 
 			this.fetchInstanceMetadataService.fetchInstanceMetadata(i);