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/ollama/handlers/main.yml

@@ -0,0 +1,20 @@
+---
+# ------------------------------------------------------------------------------
+# FILE: roles/ollama/handlers/main.yml
+# ------------------------------------------------------------------------------
+
+- name: update apt cache
+  apt:
+    update_cache: yes
+
+- name: update initramfs
+  command: update-initramfs -u
+
+- name: reload systemd
+  systemd:
+    daemon_reload: yes
+
+- name: restart ollama
+  systemd:
+    name: ollama
+    state: restarted