Refactor user management in Ansible playbooks to standardize on keeper_user

- Updated user addition tasks across multiple playbooks (mcp_switchboard, mcpo, neo4j, neo4j_mcp, openwebui, postgresql, rabbitmq, searxng, smtp4dev) to replace references to ansible_user and remote_user with keeper_user.
- Modified PostgreSQL deployment to create directories and manage files under keeper_user's home.
- Enhanced documentation to clarify account taxonomy and usage of keeper_user in playbooks.
- Introduced new deployment for Agent S, including environment setup, desktop environment installation, XRDP configuration, and accessibility support.
- Added staging playbook for preparing release tarballs from local repositories.
- Created templates for XRDP configuration and environment activation scripts.
- Removed obsolete sunwait documentation.

terraform/containers.tf

@@ -7,9 +7,9 @@ packages:
   - apt-utils
   - openssh-server
 users:
-  - name: ${var.system_user}
-    uid: ${var.user_uid}
-    system: true
+  - name: ${var.keeper_user}
+    uid: ${var.keeper_uid}
+    homedir: /srv/${var.keeper_user}
     sudo: ALL=(ALL) NOPASSWD:ALL
     shell: /bin/bash
     groups: sudo
@@ -271,11 +271,15 @@ resource "incus_instance" "uranian_hosts" {
   )
 
   file {
-    target_path        = "/home/${var.system_user}/.ssh/authorized_keys"
+    target_path        = "/srv/${var.keeper_user}/.ssh/authorized_keys"
     source_path        = var.ssh_key_path
-    uid                = var.user_uid
-    gid                = var.user_uid
+    uid                = var.keeper_uid
+    gid                = var.keeper_uid
     mode               = 0750
     create_directories = true
   }
+
+  lifecycle {
+    ignore_changes = [config]
+  }
 }