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