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 266141f66f.

* 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/misskey-js/etc/misskey-js.api.md

@@ -398,6 +398,12 @@ type AdminUpdateAbuseUserReportRequest = operations['admin___update-abuse-user-r
 // @public (undocumented)
 type AdminUpdateMetaRequest = operations['admin___update-meta']['requestBody']['content']['application/json'];
 
+// @public (undocumented)
+type AdminUpdateProxyAccountRequest = operations['admin___update-proxy-account']['requestBody']['content']['application/json'];
+
+// @public (undocumented)
+type AdminUpdateProxyAccountResponse = operations['admin___update-proxy-account']['responses']['200']['content']['application/json'];
+
 // @public (undocumented)
 type AdminUpdateUserNoteRequest = operations['admin___update-user-note']['requestBody']['content']['application/json'];
 
@@ -1357,6 +1363,8 @@ declare namespace entities {
         AdminUnsuspendUserRequest,
         AdminUpdateAbuseUserReportRequest,
         AdminUpdateMetaRequest,
+        AdminUpdateProxyAccountRequest,
+        AdminUpdateProxyAccountResponse,
         AdminUpdateUserNoteRequest,
         AnnouncementsRequest,
         AnnouncementsResponse,