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-full-stateful/README.md

@@ -0,0 +1,11 @@
+# Database Docker with Web Proxy
+
+This role builds on `sys-stk-back-stateful` by adding a reverse-proxy frontend for HTTP access to your database service.
+
+## Features
+
+- **Database Composition**  
+  Leverages the `sys-stk-back-stateful` role to stand up your containerized database (PostgreSQL, MariaDB, etc.) with backups and user management.
+
+- **Reverse Proxy**  
+  Includes the `sys-stk-front` role to configure a proxy (e.g. nginx) for routing HTTP(S) traffic to your database UI or management endpoint.

roles/sys-stk-full-stateful/meta/main.yml

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+galaxy_info:
+  author: "Kevin Veen-Birkenbach"
+  description: >
+    Extends sys-stk-back-stateful by adding an HTTP reverse proxy via sys-stk-front.
+  company: |
+    Kevin Veen-Birkenbach
+    Consulting & Coaching Solutions
+    https://www.veen.world
+  license: "Infinito.Nexus NonCommercial License"
+  license_url: "https://s.infinito.nexus/license"
+  galaxy_tags:
+    - docker
+    - database
+    - proxy
+    - compose

roles/sys-stk-full-stateful/tasks/main.yml

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+# run_once_sys_stk_full_stateful: deactivated
+
+- include_tasks: "{{ playbook_dir }}/tasks/utils/load_handlers.yml"
+  vars:
+    handler_role_name: "svc-prx-openresty"
+
+- name: "For '{{ application_id }}': include role sys-stk-front"
+  include_role:
+    name: sys-stk-front
+  vars:
+    domain:     "{{ domains | get_domain(application_id) }}"
+    http_port:  "{{ ports.localhost.http[application_id] }}"
+
+- name: "For '{{ application_id }}': load docker and db"
+  include_role:
+    name: sys-stk-back-stateful