feat(mediawiki): Refactor OIDC + debug; install Composer deps in-container; modularize role

Discussion: https://chatgpt.com/share/68b10c0a-c308-800f-93ac-2ffb386cf58b

- Split tasks into 01_install, 02_debug, 03_admin, 04_extensions, 05_oidc.
- Ensure unzip+git+composer on demand in the container; run Composer as www-data with COMPOSER_HOME=/tmp/composer.
- Idempotently unpack/install PluggableAuth & OpenIDConnect; run composer install only if vendor/ is missing.
- Add sanity check for Jumbojett\OpenIDConnectClient.
- Copy oidc.php only when changed and append a single require_once to LocalSettings.php.
- Use REL1_44-compatible numeric array for $wgPluggableAuth_Config; set $wgPluggableAuth_ButtonLabelMessage.
- Debug: add debug.php that logs to STDERR (visible via docker logs); toggle cleanly with MODE_DEBUG.
- Enable OIDC feature in config; add paths/OIDC/extension vars in vars/main.yml.

fix(services): include SYS_SERVICE_GROUP_CLEANUP in StartPre lock (ssd-hdd, docker-hard).

fix(desktop/joomla): simplify MODE_DEBUG templating.

chore: minor cleanups and renames.

roles/sys-ctl-rpr-docker-hard/tasks/01_core.yml

@@ -8,7 +8,7 @@
   vars:
     system_service_on_calendar:         "{{ SYS_SCHEDULE_REPAIR_DOCKER_HARD }}"
     system_service_timer_enabled:       true
-    system_service_tpl_exec_start_pre:  '/usr/bin/python {{ PATH_SYSTEM_LOCK_SCRIPT }} {{ SYS_SERVICE_GROUP_MANIPULATION | join(" ")  }} --ignore {{ SYS_SERVICE_REPAIR_DOCKER_HARD }} --timeout "{{ SYS_TIMEOUT_RESTART_DOCKER }}"'
+    system_service_tpl_exec_start_pre:  '/usr/bin/python {{ PATH_SYSTEM_LOCK_SCRIPT }} {{ SYS_SERVICE_GROUP_MANIPULATION | join(" ")  }} --ignore {{ SYS_SERVICE_REPAIR_DOCKER_HARD }} {{ SYS_SERVICE_GROUP_CLEANUP | join(" ")  }} --timeout "{{ SYS_TIMEOUT_RESTART_DOCKER }}"'
     system_service_tpl_exec_start:      '{{ system_service_script_exec }} {{ PATH_DOCKER_COMPOSE_INSTANCES }}'
     system_service_tpl_exec_start_post: "/usr/bin/systemctl start {{ SYS_SERVICE_CLEANUP_ANONYMOUS_VOLUMES }}"
     system_service_tpl_on_failure:      "{{ SYS_SERVICE_ON_FAILURE_COMPOSE }}"