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/ssh-agent.service.j2

@@ -0,0 +1,17 @@
+[Unit]
+Description=SSH Agent for devstation
+After=network.target
+
+[Service]
+Type=simple
+User={{ linux_dev_station_service_user }}
+Group={{ linux_dev_station_service_user }}
+ExecStart=/usr/bin/ssh-agent -a {{ linux_dev_station_ssh_agent_socket }}
+Restart=always
+RestartSec=5
+StandardOutput=append:{{ linux_dev_station_logs_dir }}/ssh-agent.log
+StandardError=append:{{ linux_dev_station_logs_dir }}/ssh-agent.err.log
+
+Environment="HOME={{ linux_dev_station_service_home }}"
+Environment="PATH={{ linux_dev_station_path }}"
+Environment="SSH_AUTH_SOCK={{ linux_dev_station_ssh_agent_socket }}"