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/create_jarvis_user.yml

@@ -0,0 +1,6 @@
+---
+- name: Create jarvis user and deploy SSH key
+  hosts: all
+  become: true
+  roles:
+    - jarvis_user