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/variables.tf

@@ -22,16 +22,16 @@ variable "storage_pool" {
   default     = "default"
 }
 
-variable "system_user" {
-  description = "System user name for sandbox hosts"
+variable "keeper_user" {
+  description = "Keeper user name for container management (keeper_user taxonomy)"
   type        = string
-  default     = "robert"
+  default     = "ponos"
 }
 
-variable "user_uid" {
-  description = "System user UID"
+variable "keeper_uid" {
+  description = "Keeper user UID"
   type        = number
-  default     = 1000
+  default     = 519
 }
 
 variable "ssh_key_path" {