refactor: consolidate all roles into ansible/roles/ and update ansible.cfg

- Move all roles from playbooks/roles/ to roles/
- Update roles_path in ansible.cfg
- Add cast user to common role
- Create standalone podman role
- Add semaphore role with Podman + Quadlet support

ansible/roles/docker-host/handlers/main.yml

@@ -0,0 +1,8 @@
+# ------------------------------------------------------------------------------
+# FILE: roles/docker-host/handlers/main.yml
+# ------------------------------------------------------------------------------
+
+- name: restart docker
+  systemd:
+    name: docker
+    state: restarted