enhance(backend): refine system account (#15530)

* wip

* wip

* wip

* Update SystemAccountService.ts

* Update 1740121393164-system-accounts.js

* Update DeleteAccountService.ts

* wip

* wip

* wip

* wip

* Update 1740121393164-system-accounts.js

* Update RepositoryModule.ts

* wip

* wip

* wip

* Update ApRendererService.ts

* wip

* wip

* Update SystemAccountService.ts

* fix tests

* fix tests

* fix tests

* fix tests

* fix tests

* fix tests

* add print logs

* ログが長すぎて出てないかもしれない

* fix migration

* refactor

* fix fed-tests

* Update RelayService.ts

* merge

* Update user.test.ts

* chore: emit log

* fix: tweak sleep duration

* fix: exit 1

* fix: wait for misskey processes to become healthy

* fix: longer sleep for user deletion

* fix: make sleep longer again

* デッドロック解消の試み

https://github.com/misskey-dev/misskey/issues/15005

* Revert "デッドロック解消の試み"

This reverts commit 266141f66fb584371bbb56ef7eba04e14bcff94d.

* wip

* Update SystemAccountService.ts

---------

Co-authored-by: おさむのひと <46447427+samunohito@users.noreply.github.com>
Co-authored-by: zyoshoka <107108195+zyoshoka@users.noreply.github.com>

packages/backend/src/server/api/endpoint-list.ts

@@ -100,6 +100,7 @@ export * as 'admin/unset-user-banner' from './endpoints/admin/unset-user-banner.
 export * as 'admin/unsuspend-user' from './endpoints/admin/unsuspend-user.js';
 export * as 'admin/update-abuse-user-report' from './endpoints/admin/update-abuse-user-report.js';
 export * as 'admin/update-meta' from './endpoints/admin/update-meta.js';
+export * as 'admin/update-proxy-account' from './endpoints/admin/update-proxy-account.js';
 export * as 'admin/update-user-note' from './endpoints/admin/update-user-note.js';
 export * as 'announcements' from './endpoints/announcements.js';
 export * as 'announcements/show' from './endpoints/announcements/show.js';