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/sys-stk-back-stateless/tasks/main.yml

@@ -0,0 +1,19 @@
+# run_once_sys_stk_back_stateless: disabled
+
+- name: "For '{{ application_id }}': Load docker-compose"
+  include_role: 
+    name: docker-compose
+  vars:
+    docker_compose_flush_handlers: false
+
+- block:
+    - name: "set oauth2_proxy_application_id (Needed due to lazzy loading issue)"
+      set_fact:
+        oauth2_proxy_application_id: "{{ application_id }}"
+    - name: "include the web-app-oauth2-proxy role {{ domain }}"
+      include_tasks: "{{ playbook_dir }}/roles/web-app-oauth2-proxy/tasks/main.yml"
+  when: applications | get_app_conf(application_id, 'features.oauth2', False)
+
+- name: "flush docker compose and oauth2 proxy for '{{ application_id }}'"
+  meta: flush_handlers
+  when: docker_compose_flush_handlers | bool