Adds support for SMTP and email-related settings
added in Continuwuity 0.5.7.

The official project rooms are on v12 and support has been stable enough for quite some releases now. Its also just plain old bad security practice to run v11 outside of closed federations.

The upstream docs are simply out of date on this one.

Replace hardcoded restart_necessary: true with computed values for:
conduit, continuwuity, dendrite, element-call, media-repo,
appservice-kakaotalk, and wechat.

Each role now registers results from config, support files, systemd service,
and docker image pull tasks, then computes a restart_necessary variable
from their combined .changed state. group_vars/matrix_servers is updated
to reference these variables instead of hardcoding true.

For dendrite, the systemd service template was also separated out of the
combined support-files with_items loop so it can be independently tracked.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

The previous depName (forgejo.ellis.link/continuwuation/-/packages/container/continuwuity/)
was a Forgejo web UI path, not the Docker image name. Renovate's docker datasource
needs the image name as used in `docker pull`.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Add matrix_continuwuity_version with container_image_tag inheriting from it.
Rename all _docker_image* variables to _container_image* with deprecation notices.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* continuwuity support

* continuwuity support

* use main instead of commit tag

* fix docker image link

* migration from conduwuit

* fix yaml lint

* backup directories and linter fixes

* linter fixes