Enhance Linux and macOS development station configurations:

- Add user management and Oh My Zsh settings
- Update service scripts to use Zsh
- Include new packages and environment variables
- Modify Terraform configuration for upstream services

ansible/roles/linux_dev_station/templates/opencode.service.j2

@@ -7,7 +7,7 @@ Type=simple
 User={{ linux_dev_station_service_user }}
 Group={{ linux_dev_station_service_user }}
 WorkingDirectory={{ linux_dev_station_workspace_dir }}
-ExecStart=/bin/bash {{ linux_dev_station_scripts_dir }}/start-opencode.sh
+ExecStart=/bin/zsh -i {{ linux_dev_station_scripts_dir }}/start-opencode.sh
 Restart=always
 RestartSec=5
 StandardOutput=append:{{ linux_dev_station_logs_dir }}/opencode.log
@@ -15,6 +15,7 @@ StandardError=append:{{ linux_dev_station_logs_dir }}/opencode.err.log
 
 Environment="HOME={{ linux_dev_station_service_home }}"
 Environment="PATH={{ linux_dev_station_path }}"
+Environment="TMPDIR={{ linux_dev_station_service_home }}/.cache/tmp"
 Environment="OPENCODE_SERVER_USERNAME={{ linux_dev_station_opencode_server_username }}"
 Environment="OPENCODE_SERVER_PASSWORD={{ linux_dev_station_opencode_server_password }}"
 {% for env_key, env_value in linux_dev_station_opencode_extra_environment.items() %}