Add conditional restart support to client, bot, and bridge roles

For each of the 34 roles (3 clients, 9 bots, 22 bridges), this commit:
- Adds `_restart_necessary: false` default variable
- Adds `register:` directives to config/image/systemd tasks
- Computes `_restart_necessary` via set_fact (OR of all .changed results)
- Wires `(_restart_necessary | bool)` in group_vars/matrix_servers

This allows the systemd service manager to skip unnecessary restarts
when running install-* tags and nothing actually changed.

Service roles and complex multi-service roles will follow separately.

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

roles/custom/matrix-client-fluffychat/defaults/main.yml

@@ -152,3 +152,13 @@ matrix_client_fluffychat_self_check_validate_certificates: true
 
 # Controls the default homeserver domain (not URL) used in the FluffyChat Web configuration.
 matrix_client_fluffychat_config_defaultHomeserver: ~
+
+# matrix_client_fluffychat_restart_necessary controls whether the service
+# will be restarted (when true) or merely started (when false) by the
+# systemd service manager role (when conditional restart is enabled).
+#
+# This value is automatically computed during installation based on whether
+# any configuration files, the systemd service file, or the container image changed.
+# The default of `false` means "no restart needed" — appropriate when the role's
+# installation tasks haven't run (e.g., due to --tags skipping them).
+matrix_client_fluffychat_restart_necessary: false

roles/custom/matrix-client-fluffychat/tasks/setup_install.yml

@@ -24,10 +24,10 @@
     force_source: "{{ matrix_client_fluffychat_docker_image_force_pull if ansible_version.major > 2 or ansible_version.minor >= 8 else omit }}"
     force: "{{ omit if ansible_version.major > 2 or ansible_version.minor >= 8 else matrix_client_fluffychat_docker_image_force_pull }}"
   when: "not matrix_client_fluffychat_container_image_self_build | bool"
-  register: result
+  register: matrix_client_fluffychat_container_image_pull_result
   retries: "{{ devture_playbook_help_container_retries_count }}"
   delay: "{{ devture_playbook_help_container_retries_delay }}"
-  until: result is not failed
+  until: matrix_client_fluffychat_container_image_pull_result is not failed
 
 - when: "matrix_client_fluffychat_container_image_self_build | bool"
   block:
@@ -61,6 +61,7 @@
     - {src: "{{ role_path }}/templates/labels.j2", dest: "{{ matrix_client_fluffychat_base_path }}/labels"}
     - {src: "{{ role_path }}/templates/config.json.j2", dest: "{{ matrix_client_fluffychat_config_path }}/config.json"}
   when: "item.src is not none"
+  register: matrix_client_fluffychat_config_result
 
 - name: Ensure FluffyChat Web container network is created
   community.general.docker_network:
@@ -74,3 +75,13 @@
     src: "{{ role_path }}/templates/systemd/matrix-client-fluffychat.service.j2"
     dest: "{{ devture_systemd_docker_base_systemd_path }}/matrix-client-fluffychat.service"
     mode: 0644
+  register: matrix_client_fluffychat_systemd_service_result
+
+- name: Determine whether FluffyChat Web needs a restart
+  ansible.builtin.set_fact:
+    matrix_client_fluffychat_restart_necessary: >-
+      {{
+        matrix_client_fluffychat_config_result.changed | default(false)
+        or matrix_client_fluffychat_systemd_service_result.changed | default(false)
+        or matrix_client_fluffychat_container_image_pull_result.changed | default(false)
+      }}