refactor(web-app-wordpress): unify variable naming to uppercase WORDPRESS_* style

- Replaced all lowercase wordpress_* variables with uppercase WORDPRESS_* equivalents
- Ensured consistency across tasks, templates, and vars
- Improves readability and aligns with naming conventions

Conversation: https://chatgpt.com/share/68af29b5-8e7c-800f-bd12-48cc5956311c

roles/web-app-wordpress/templates/Dockerfile.j2

@@ -1,4 +1,4 @@
-FROM {{ wordpress_image }}:{{ wordpress_version }}
+FROM {{ WORDPRESS_IMAGE }}:{{ WORDPRESS_VERSION }}
 
 # Install msmtp and update system
 RUN apt-get update && \

roles/web-app-wordpress/templates/docker-compose.yml.j2

@@ -1,14 +1,14 @@
 {% include 'roles/docker-compose/templates/base.yml.j2' %}
   application:
     {% include 'roles/docker-container/templates/base.yml.j2' %}
-    image: {{ wordpress_custom_image }}
-    container_name: {{ wordpress_container }}
+    image: {{ WORDPRESS_CUSTOM_IMAGE }}
+    container_name: {{ WORDPRESS_CONTAINER }}
     build:
       context: .
     ports:
       - "127.0.0.1:{{ ports.localhost.http[application_id] }}:80"
     volumes:
-      - data:{{ wordpress_docker_html_path }}
+      - data:{{ WORDPRESS_DOCKER_HTML_PATH }}
 
 {% include 'roles/docker-container/templates/healthcheck/msmtp_curl.yml.j2' %}
 {% include 'roles/docker-container/templates/depends_on/dmbs_excl.yml.j2' %}
@@ -18,4 +18,4 @@
 
 {% include 'roles/docker-compose/templates/volumes.yml.j2' %}
   data:
-    name:   "{{ wordpress_volume }}"
+    name:   "{{ WORDPRESS_VOLUME }}"

roles/web-app-wordpress/templates/upload.ini.j2

@@ -1,7 +1,7 @@
 file_uploads        = On
-memory_limit        = {{ wordpress_max_upload_size }}
-upload_max_filesize = {{ wordpress_max_upload_size }}
-post_max_size       = {{ wordpress_max_upload_size }}
+memory_limit        = {{ WORDPRESS_MAX_UPLOAD_SIZE }}
+upload_max_filesize = {{ WORDPRESS_MAX_UPLOAD_SIZE }}
+post_max_size       = {{ WORDPRESS_MAX_UPLOAD_SIZE }}
 max_execution_time  = 300
 
 ; Use msmtp as the Mail Transfer Agent