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.

ansible/casdoor/deploy.yml

@@ -45,10 +45,10 @@
         create_home: false
         shell: /usr/sbin/nologin
 
-    - name: Add ansible_user to casdoor group
+    - name: Add keeper_user to casdoor group
       become: true
       ansible.builtin.user:
-        name: "{{ ansible_user }}"
+        name: "{{ keeper_user }}"
         groups: "{{ casdoor_group }}"
         append: true