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/vars/database.yml

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+# Helper variables
+_dbtype:                          "{{ (database_type | d('') | trim) }}"
+_database_id:                     "{{ ('svc-db-' ~ _dbtype) if _dbtype else '' }}"
+_database_central_name:           "{{ (applications | get_app_conf(_database_id, 'docker.services.' ~ _dbtype ~ '.name', False, '')) if _dbtype else '' }}"
+_database_consumer_id:            "{{ database_application_id | d(application_id) }}"
+_database_consumer_entity_name:   "{{ _database_consumer_id | get_entity_name }}"
+_database_central_enabled:        "{{ (applications | get_app_conf(_database_consumer_id, 'features.central_database', False)) if _dbtype else False }}"
+
+# Definition
+
+database_name:      "{{ _database_consumer_entity_name }}"
+database_instance:  "{{ _database_central_name if _database_central_enabled else database_name }}" # This could lead to bugs at dedicated database @todo cleanup
+database_host:      "{{ _database_central_name if _database_central_enabled else 'database' }}"    # This could lead to bugs at dedicated database @todo cleanup
+database_username:  "{{ _database_consumer_entity_name }}"
+database_password:  "{{ applications | get_app_conf(_database_consumer_id, 'credentials.database_password', true) }}"
+database_port:      "{{ (ports.localhost.database[_database_id] | d('')) if _dbtype else '' }}"
+database_env:       "{{ docker_compose.directories.env }}{{ database_type }}.env"
+database_url_jdbc:  "jdbc:{{ database_type if database_type == 'mariadb' else 'postgresql' }}://{{ database_host }}:{{ database_port }}/{{ database_name }}"
+database_url_full:  "{{ database_type }}://{{ database_username }}:{{ database_password }}@{{ database_host }}:{{ database_port }}/{{ database_name }}"
+database_volume:    "{{ _database_consumer_entity_name ~ '_' if not _database_central_enabled }}{{ database_host }}"

roles/sys-svc-rdbms/vars/main.yml

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+# Docker
+docker_pull_git_repository: false # Deactivated here to don't inhire this