Add Linux development station role with systemd services for code-server and OpenCode

- Implemented handlers for restarting code-server and OpenCode services.
- Created main tasks for setting up a Linux development station, including user management, package installation, and configuration.
- Added validation for OpenCode server credentials and code-server password.
- Introduced tool package management for npm, uv, and go installers.
- Developed templates for systemd service units for code-server and OpenCode.
- Included scripts for starting code-server and OpenCode with SSH agent support.
- Updated inventory and Terraform configuration to include new development host.

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

@@ -0,0 +1,28 @@
+[Unit]
+Description=OpenCode - AI-powered terminal IDE
+After=network.target
+
+[Service]
+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
+Restart=always
+RestartSec=5
+StandardOutput=append:{{ linux_dev_station_logs_dir }}/opencode.log
+StandardError=append:{{ linux_dev_station_logs_dir }}/opencode.err.log
+
+Environment="HOME={{ linux_dev_station_service_home }}"
+Environment="PATH={{ linux_dev_station_path }}"
+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() %}
+Environment="{{ env_key }}={{ env_value }}"
+{% endfor %}
+{% if linux_dev_station_ssh_agent_enabled | bool %}
+Environment="SSH_AUTH_SOCK={{ linux_dev_station_ssh_agent_socket }}"
+{% endif %}
+
+[Install]
+WantedBy=multi-user.target