Refactor SteamOS session management and launcher scripts

- Removed obsolete launch_desktop.sh and launch_session.sh scripts.
- Introduced new steam-launcher script to handle Steam launching and session tracking.
- Added steam-short-session-tracker for monitoring short Steam sessions and triggering repairs.
- Created steamos and steamos-session scripts for managing the SteamOS session.
- Implemented steamos-session-select for switching between Gamescope and Plasma sessions.
- Updated SDDM configuration for autologin and session management.
- Added new systemd services and targets for managing Gamescope and Steam sessions.
- Created desktop entries and icons for ALVR and SteamOS shortcuts.
- Enhanced logging and error handling across scripts.
- Cleaned up unused systemd slice and service files.
- Updated Ansible playbook to reflect new configurations and file structures.

ansible/files/game_station/systemd/user/steamos.service

@@ -1,10 +1,8 @@
 [Unit]
-Description=SteamOS user graphical session service
-After=graphical-session.target systemd-user-sessions.service
+Description=User graphical session service
+After=graphical-session.target
 
 [Service]
-ExecStart=/usr/bin/bash /usr/local/bin/steamos.sh
+ExecStart=/usr/local/bin/steamos
+EnvironmentFile=%t/steamos-environment
 Restart=on-failure
-
-[Install]
-WantedBy=default.target