Add Atlas media and storage services [Phase 1] (#9)

* Add Atlas media and storage services

* Document Atlas backend phase one and WireGuard deployment

* Enable Atlas NAS management and document bootstrap workflow

* Harden Atlas network, SSH, firewall, and sharing

* Rotate Ansible Vault secrets

* Allow configurable Aegis SSH users and authorized keys

* Manage Aegis SSH authorized key fragments

* Manage SSH authorized key fragments for infrastructure hosts

* Harden Rocky storage and sharing configuration

* Verify WireGuard handshakes and restore Podman networking

ansible/roles/profile_atlas/templates/atlas-immich-redis.container.j2

@@ -0,0 +1,20 @@
+# Managed by Ansible. Do not edit manually.
+[Unit]
+Description=Atlas Immich Redis-compatible cache
+
+[Container]
+ContainerName=atlas-immich-redis
+Image={{ atlas_immich_redis_image }}
+User={{ atlas_immich_uid }}:{{ atlas_immich_gid }}
+Network=atlas-media.network
+NetworkAlias=atlas-immich-redis
+Volume={{ atlas_immich_redis_data_dir }}:/data:Z
+NoNewPrivileges=true
+DropCapability=NET_RAW
+
+[Service]
+Restart=always
+TimeoutStartSec=900
+
+[Install]
+WantedBy=multi-user.target