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-front/tasks/cloudflare/01_cleanup.yml

@@ -0,0 +1,13 @@
+- name: "Purge everything from Cloudflare cache for domain {{ domain }}"
+  ansible.builtin.uri:
+    url: "https://api.cloudflare.com/client/v4/zones/{{ cf_zone_id }}/purge_cache"
+    method: POST
+    headers:
+      Authorization: "Bearer {{ CLOUDFLARE_API_TOKEN }}"
+      Content-Type: "application/json"
+    body:
+      purge_everything: true
+    body_format: json
+    return_content: yes
+  async: "{{ ASYNC_TIME if ASYNC_ENABLED | bool else omit }}"
+  poll:  "{{ ASYNC_POLL if ASYNC_ENABLED | bool else omit }}"