Refactor: migrate cmp/* and srv/* roles into sys-stk/* and sys-svc/* namespaces

- Removed obsolete 'cmp' category, introduced 'stk' category (fa-bars-staggered icon).
- Renamed roles:
  * cmp-db-docker → sys-stk-back-stateful
  * cmp-docker-oauth2 → sys-stk-back-stateless
  * srv-domain-provision → sys-stk-front
  * cmp-db-docker-proxy → sys-stk-full-stateful
  * cmp-docker-proxy → sys-stk-full-stateless
  * cmp-rdbms → sys-svc-rdbms
- Updated all include_role references, vars, templates and README.md files.
- Adjusted run_once comments and variable paths accordingly.
- Updated all web-app roles to use new sys-stk/* and sys-svc/* roles.

Conversation: https://chatgpt.com/share/68b0ba66-09f8-800f-86fc-76c47009d431

roles/web-app-joomla/tasks/main.yml

@@ -1,7 +1,7 @@
 ---
-- name: "Include role srv-domain-provision for {{ application_id }}"
+- name: "Include role sys-stk-front for {{ application_id }}"
   include_role:
-    name: srv-domain-provision
+    name: sys-stk-front
   loop: "{{ JOOMLA_DOMAINS }}"
   loop_control:
     loop_var: domain
@@ -10,7 +10,7 @@
 
 - name: "load docker and db for {{ application_id }}"
   include_role: 
-    name: cmp-db-docker
+    name: sys-stk-back-stateful
   vars:
     docker_compose_flush_handlers: true