feat: Add scripts and systemd services for SteamOS session management and game launching

ansible/files/game_station/bin/user/launch_genesis.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -euo pipefail
+LOGFILE="$HOME/.local/logs/retroarch-genesis.log"
+
+log() { echo "[$(date --iso-8601=seconds)] $*" | tee -a "$LOGFILE"; }
+RETROARCH_HOME="$HOME/.local/share/Steam/steamapps/common/RetroArch"
+if [ ! -d "$RETROARCH_HOME" ]; then
+  log "ERROR: RetroArch directory not found at $RETROARCH_HOME, install it via Steam"
+  exit 127
+fi
+
+RETROARCH_BIN="$RETROARCH_HOME/retroarch"
+RETROARCH_CORE=genesis_plus_gx_libretro.so
+if [ ! -f "$RETROARCH_BIN" ] || [ ! -f "$RETROARCH_HOME/cores/$RETROARCH_CORE" ]; then
+  log "ERROR: retroarch or core not found, install it via Steam"
+  exit 127
+fi
+
+log "Launching RetroArch: $RETROARCH_BIN -L \"$RETROARCH_HOME/cores/$RETROARCH_CORE\" \"${@}\""
+cd "$RETROARCH_HOME"
+$HOME/.steam/steam/ubuntu12_32/steam-runtime/run.sh "$RETROARCH_BIN" -L "$RETROARCH_HOME/cores/$RETROARCH_CORE" "${@}" >>"$LOGFILE"
+