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/target/defaults/main.yml

@@ -0,0 +1,3 @@
+---
+node_exporter_version: v1.4.0
+cadvisor_version: v0.46.0