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/common/defaults/main.yml

@@ -0,0 +1,35 @@
+---
+# ------------------------------------------------------------------------------
+# FILE: roles/common/defaults/main.yml
+# ------------------------------------------------------------------------------
+
+common_timezone: America/Chicago
+
+common_ntp_server: "sundial.local.mk-labs.cloud"
+
+common_packages:
+  - acl
+  - curl
+  - wget
+  - vim
+  - htop
+  - git
+  - jq
+  - unzip
+  - ca-certificates
+  - gnupg
+  - lsb-release
+  - net-tools
+  - dnsutils
+  - lvm2
+
+# ------------------------------------------------------------------------------
+# LVM root volume expansion
+# Override common_root_pv/vg/lv per host if the template uses different names.
+# Ubuntu 24.04 cloud templates use ubuntu-vg/ubuntu-lv by default.
+# ------------------------------------------------------------------------------
+
+common_expand_root_lvm: true
+common_root_pv: /dev/sda3       # Ubuntu cloud-init partition layout
+common_root_vg: ubuntu-vg
+common_root_lv: ubuntu-lv