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/svc-opt-ssd-hdd/tasks/main.yml

@@ -1,5 +1,5 @@
 - include_role:
     name: sys-service
   vars:
-    system_service_tpl_exec_start_pre: '/usr/bin/python {{ PATH_SYSTEM_LOCK_SCRIPT }} {{ SYS_SERVICE_GROUP_MANIPULATION | join(" ")  }} --ignore {{ SYS_SERVICE_OPTIMIZE_DRIVE }} {{ SYS_SERVICE_BACKUP_RMT_2_LOC }} --timeout "{{ SYS_TIMEOUT_STORAGE_OPTIMIZER }}"'
+    system_service_tpl_exec_start_pre: '/usr/bin/python {{ PATH_SYSTEM_LOCK_SCRIPT }} {{ SYS_SERVICE_GROUP_MANIPULATION | join(" ")  }} --ignore {{ SYS_SERVICE_OPTIMIZE_DRIVE }} {{ SYS_SERVICE_BACKUP_RMT_2_LOC }} {{ SYS_SERVICE_GROUP_CLEANUP | join(" ")  }} --timeout "{{ SYS_TIMEOUT_STORAGE_OPTIMIZER }}"'
     system_service_tpl_exec_start:      '{{ system_service_script_exec }} --mass-storage-path {{ OPT_DRIVE_MASS_STORAGE_PATH }} --rapid-storage-path {{ OPT_DRIVE_RAPID_STORAGE_PATH }}'