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/misskey-js/src/autogen/types.ts

@@ -4475,6 +4475,8 @@ export type components = {
       followersCount: number;
       isNotResponding: boolean;
       isSuspended: boolean;
+      /** @enum {string} */
+      suspensionState: 'none' | 'manuallySuspended' | 'goneSuspended' | 'autoSuspendedForNotResponding';
       isBlocked: boolean;
       /** @example misskey */
       softwareName: string | null;