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/bin/system/steamos-session

@@ -0,0 +1,26 @@
+# #!/bin/bash
+set -euo pipefail
+LOG_FILE="$HOME/.local/logs/session.log"
+
+log() { echo "[$(date --iso-8601=seconds)] $*" | tee -a "$LOG_FILE"; }
+
+env > $XDG_RUNTIME_DIR/steamos-environment
+log "Starting SteamOS Session"
+while true; do
+    systemctl --user --wait start steamos.service
+    wait_status=$?
+    log "Graphical session service exited with status $wait_status"
+    if [ $wait_status -ne 0 ]; then
+        log "Graphical session service exited with error; ending loop."
+        break
+    fi
+    if [ -f "$HOME/.steamos-session-switch" ]; then
+        log "Graphical session service exited; switch file present -> restarting..."
+        rm "$HOME/.steamos-session-switch"
+        continue
+    fi
+    log "Graphical session service exited; switch file absent -> ending loop."
+    break
+done
+sleep 5
+log "SteamOS Session Ended"