refactor(web-app-mediawiki): unify debug & oidc handling via _ensure_require, introduce host-side prep, switch to bind mounts

- Removed obsolete Installation.md, TODO.md, 02_debug.yml, 05_oidc.yml and legacy debug enable/disable tasks
- Added 01_prep.yml to render debug.php/oidc.php on host side before container start
- Introduced _ensure_require.yml for generic require_once management in LocalSettings.php
- Renamed 01_install.yml -> 02_install.yml to align with new numbering
- Updated docker-compose.yml.j2 to bind-mount mw-local into /opt/mw-local
- Adjusted vars/main.yml to define MEDIAWIKI_LOCAL_MOUNT_DIR and MEDIAWIKI_LOCAL_PATH
- Templates debug.php.j2 and oidc.php.j2 now gated by MODE_DEBUG and MEDIAWIKI_OIDC_ENABLED
- main.yml now orchestrates prep, install, debug, extensions, oidc require, admin consistently

Ref: https://chatgpt.com/share/68b57db2-efcc-800f-a733-aca952298437

roles/web-app-mediawiki/vars/main.yml

@@ -10,7 +10,9 @@ MEDIAWIKI_URL:                    "{{ domains | get_url(application_id, WEB_PROT
 ## Folders
 MEDIAWIKI_HTML_DIR:               "/var/www/html"
 MEDIAWIKI_CONFIG_DIR:             "{{ docker_compose.directories.config }}"
-MEDIAWIKI_OIDC_FILE:              "{{ docker_compose.directories.config }}/oidc.php"
+MEDIAWIKI_VOLUMES_DIR:            "{{ docker_compose.directories.volumes }}"
+MEDIAWIKI_LOCAL_MOUNT_DIR:        "{{ MEDIAWIKI_VOLUMES_DIR }}/mw-local"
+MEDIAWIKI_LOCAL_PATH:             "/opt/mw-local"
 
 ## Docker
 MEDIAWIKI_VERSION:                "{{ applications | get_app_conf(application_id, 'docker.services.mediawiki.version') }}"
@@ -32,10 +34,10 @@ MEDIAWIKI_OIDC_ISSUER:            "{{ OIDC.CLIENT.ISSUER_URL }}"
 MEDIAWIKI_OIDC_BUTTON_TEXT:       "{{ OIDC.BUTTON_TEXT }}"
 
 # Extensions
-MEDIAWIKI_EXT_BRANCH:   "REL1_44"                                   # passend zu MediaWiki 1.44
+MEDIAWIKI_EXT_BRANCH:   "REL1_44"
 MEDIAWIKI_EXT_CFG_BASE: "{{ MEDIAWIKI_CONFIG_DIR }}/mwext/{{ MEDIAWIKI_EXT_BRANCH }}"
 MEDIAWIKI_EXT_LIST:
   - name: "PluggableAuth"
     url: "https://codeload.github.com/wikimedia/mediawiki-extensions-PluggableAuth/tar.gz/refs/heads/{{ MEDIAWIKI_EXT_BRANCH }}"
   - name: "OpenIDConnect"
-    url: "https://codeload.github.com/wikimedia/mediawiki-extensions-OpenIDConnect/tar.gz/refs/heads/{{ MEDIAWIKI_EXT_BRANCH }}"
+    url: "https://codeload.github.com/wikimedia/mediawiki-extensions-OpenIDConnect/tar.gz/refs/heads/{{ MEDIAWIKI_EXT_BRANCH }}"