Synapse Admin is Ketesa now! (#5113)

* Synapse Admin is Ketesa now!

* i18n changes

* add automatic migration

* fix migration version in vars

* add a note about routing for OIDC Auth

* mention v1.0.0 announcement blog post

* Update docs/container-images.md

Co-authored-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Update CHANGELOG.md

Co-authored-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

---------

Co-authored-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

i18n/translation-templates/docs/configuring-playbook-element-admin.pot

@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: matrix-docker-ansible-deploy \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2026-02-13 10:32+0000\n"
+"POT-Creation-Date: 2026-04-03 11:56+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -33,7 +33,7 @@ msgid "See the project's [documentation](https://github.com/element-hq/element-a
 msgstr ""
 
 #: ../../../docs/configuring-playbook-element-admin.md:16
-msgid "💡 **Note**: This project is still very young and doesn't have many features. For now, it's recommended to use [Synapse Admin](./configuring-playbook-synapse-admin.md) instead. Deployments that use [Matrix Authentication Service](./configuring-playbook-matrix-authentication-service.md) can use Element Admin for user-management (something that Synapse Admin can't do), while continuing to use Synapse Admin for all other purposes."
+msgid "💡 **Note**: This project is still very young and doesn't have many features. [Ketesa](./configuring-playbook-ketesa.md) is the fully-featured alternative — it covers all Synapse and MAS Admin APIs, including complete user management, session management, and MAS policy data. Element Admin remains a valid choice if you prefer its interface."
 msgstr ""
 
 #: ../../../docs/configuring-playbook-element-admin.md:18