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-svc-rdbms/tasks/main.yml

@@ -0,0 +1,26 @@
+# run_once_sys_svc_rdbms: deactivated
+
+# The following env file will just be used from the dedicated mariadb container
+# and not the central one
+- block:
+  - name: "Ensure env dir exists: {{ docker_compose.directories.env }}"
+    ansible.builtin.file:
+      path: "{{ docker_compose.directories.env }}"
+      state: directory
+      mode: "0755"
+  - name: "For '{{ application_id }}': Create {{database_env}}"
+    template: 
+      src: "env/{{database_type}}.env.j2"
+      dest: "{{database_env}}"
+    notify: docker compose up
+  when: not applications | get_app_conf(application_id, 'features.central_database', False)
+
+- name: "For '{{ application_id }}': Create central database"
+  # I don't know why this includes leads to that the application_id in vars/main.yml of the database role isn't used
+  # This is the behaviour which I want, but I'm still wondering why ;)
+  include_role:
+    name: "svc-db-{{database_type}}"
+  when: applications | get_app_conf(application_id, 'features.central_database', False)
+
+- name: "For '{{ application_id }}': Add Entry for Backup Procedure"
+  include_tasks: "{{ playbook_dir }}/roles/sys-ctl-bkp-docker-2-loc/tasks/04_seed-database-to-backup.yml"